Abstract

We study trapped single excitons in a monolayer semiconductor with respect to their temperature stability, spectral diffusion and decay dynamics. In a mechanically exfoliated WSe2 sheet, we could identify discrete emission features with emission energies down to 1.516 eV which are spectrally isolated in a free spectral range up to 80 meV. The strong spectral isolation of our localized emitter allow us to identify strong signatures of phonon induced spectral broadening for elevated temperatures accompanied by temperature induced luminescence quenching. A direct correlation between the droop in intensity at higher temperatures with the phonon induced population of dark states in WSe2 is established. While our experiment suggests that the applicability of monolayered quantum emitters as coherent single photon sources at elevated temperatures may be limited, the capability to operate them below the GaAs band-edge makes them highly interesting for GaAs-monolayer hybrid quantum photonic structures.

© 2016 Optical Society of America

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  1. P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
    [Crossref] [PubMed]
  2. F. Diedrich and H. Walther, “Nonclassical radiation of a single stored ion,” Phys. Rev. Lett. 58(3), 203–206 (1987).
    [Crossref] [PubMed]
  3. K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
    [Crossref]
  4. F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
    [Crossref] [PubMed]
  5. X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
    [Crossref]
  6. A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
    [Crossref]
  7. D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
    [Crossref] [PubMed]
  8. K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
    [Crossref]
  9. T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
    [Crossref] [PubMed]
  10. H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
    [Crossref]
  11. Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
    [Crossref]
  12. M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
    [Crossref]
  13. C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
    [Crossref]
  14. A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
    [Crossref]
  15. P. Tonndorf, R. Schmidt, R. Schneider, J. Kern, M. Buscema, G. A. Steele, A. Castellanos-Gomez, H. S. J. van der Zant, S. M. de Vasconcellos, and R. Bratschitsch, “Single-photon emission from localized excitons in an atomically thin semiconductor,” Optica 2(4), 347–352 (2015).
    [Crossref]
  16. S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
    [Crossref] [PubMed]
  17. K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
    [Crossref] [PubMed]
  18. J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
    [Crossref]
  19. B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
    [Crossref]
  20. M. Bayer and A. Forchel, “Temperature dependence of the exciton homogeneous linewidth in In0.60Ga0.40As/GaAs self-assembled quantum dots,” Phys. Rev. B 65(4), 041308 (2002).
    [Crossref]
  21. O. Labeau, P. Tamarat, and B. Lounis, “Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots,” Phys. Rev. Lett. 90(25), 257404 (2003).
    [Crossref] [PubMed]
  22. X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
    [Crossref]

2015 (8)

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

P. Tonndorf, R. Schmidt, R. Schneider, J. Kern, M. Buscema, G. A. Steele, A. Castellanos-Gomez, H. S. J. van der Zant, S. M. de Vasconcellos, and R. Bratschitsch, “Single-photon emission from localized excitons in an atomically thin semiconductor,” Optica 2(4), 347–352 (2015).
[Crossref]

S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
[Crossref] [PubMed]

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
[Crossref]

2014 (1)

X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
[Crossref]

2013 (2)

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

2012 (4)

D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
[Crossref] [PubMed]

K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
[Crossref]

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
[Crossref]

2010 (1)

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

2005 (1)

K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

2003 (1)

O. Labeau, P. Tamarat, and B. Lounis, “Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots,” Phys. Rev. Lett. 90(25), 257404 (2003).
[Crossref] [PubMed]

2002 (1)

M. Bayer and A. Forchel, “Temperature dependence of the exciton homogeneous linewidth in In0.60Ga0.40As/GaAs self-assembled quantum dots,” Phys. Rev. B 65(4), 041308 (2002).
[Crossref]

2000 (2)

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

1987 (1)

F. Diedrich and H. Walther, “Nonclassical radiation of a single stored ion,” Phys. Rev. Lett. 58(3), 203–206 (1987).
[Crossref] [PubMed]

Aivazian, G.

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Allain, A. V.

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

Arora, A.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

Astakhov, G.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

Bacher, G.

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

Bayer, M.

M. Bayer and A. Forchel, “Temperature dependence of the exciton homogeneous linewidth in In0.60Ga0.40As/GaAs self-assembled quantum dots,” Phys. Rev. B 65(4), 041308 (2002).
[Crossref]

Beams, R.

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

Becher, C.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Booth, T. J.

K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

Bratschitsch, R.

Buscema, M.

Cao, T.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

Castellanos-Gomez, A.

Chakraborty, C.

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

Chen, M.-C.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Cherkez, V.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

Clark, G.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Clark, S.

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

Cui, X.

H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
[Crossref]

Dai, J.

H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
[Crossref]

De Greve, K.

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

de Vasconcellos, S. M.

Diedrich, F.

F. Diedrich and H. Walther, “Nonclassical radiation of a single stored ion,” Phys. Rev. Lett. 58(3), 203–206 (1987).
[Crossref] [PubMed]

Ding, X.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Dyakonov, V.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

Feng, J.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

Feng, W.

D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
[Crossref] [PubMed]

Forchel, A.

M. Bayer and A. Forchel, “Temperature dependence of the exciton homogeneous linewidth in In0.60Ga0.40As/GaAs self-assembled quantum dots,” Phys. Rev. B 65(4), 041308 (2002).
[Crossref]

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

Fuchs, F.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

Gaj, J. A.

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Geim, A. K.

K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

Gerardot, B. D.

S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
[Crossref] [PubMed]

Ghimire, N. J.

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Golnik, A.

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Goodfellow, K. M.

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

Goryca, M.

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Han, W.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

He, K.

K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
[Crossref]

He, Y.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

He, Y.-M.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Heinz, T. F.

X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
[Crossref]

X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
[Crossref]

K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
[Crossref]

Hommel, D.

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

Hu, E.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Imamoglu, A.

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Jiang, D.

K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

Jones, A. M.

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Kaczmarczyk, A.

S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
[Crossref] [PubMed]

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B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Kern, J.

Khotkevich, V. V.

K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

Kinnischtzke, L.

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

Kiraz, A.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Kis, A.

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

Koperski, M.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

Kossacki, P.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Kumar, S.

S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
[Crossref] [PubMed]

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J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
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O. Labeau, P. Tamarat, and B. Lounis, “Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots,” Phys. Rev. Lett. 90(25), 257404 (2003).
[Crossref] [PubMed]

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K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

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A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

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J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
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K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
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T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

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D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
[Crossref] [PubMed]

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O. Labeau, P. Tamarat, and B. Lounis, “Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots,” Phys. Rev. Lett. 90(25), 257404 (2003).
[Crossref] [PubMed]

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Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

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K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
[Crossref]

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M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Marcus, J.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

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P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

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K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
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T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

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M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

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K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
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Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Panfilova, M.

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

Pawlis, A.

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

Petroff, P. M.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

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F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

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B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
[Crossref]

Potemski, M.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
[Crossref]

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

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K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
[Crossref]

Schaibley, J. R.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

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K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, “Two-dimensional atomic crystals,” Proc. Natl. Acad. Sci. USA 102(30), 10451–10453 (2005)
[Crossref] [PubMed]

Schmidt, R.

Schneider, R.

Schoenfeld, W. V.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Seufert, J.

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

Shan, J.

K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
[Crossref]

Shi, J.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

Sidler, M.

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
[Crossref]

Simin, D.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

Sleiter, D.

K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
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Srivastava, A.

A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
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Stender, B.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
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B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
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B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
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Tamarat, P.

O. Labeau, P. Tamarat, and B. Lounis, “Temperature dependence of the luminescence lifetime of single CdSe/ZnS quantum dots,” Phys. Rev. Lett. 90(25), 257404 (2003).
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Tan, P.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
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Tonndorf, P.

Trupke, M.

F. Fuchs, B. Stender, M. Trupke, D. Simin, J. Pflaum, V. Dyakonov, and G. Astakhov, “Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide,” Nat. Commun. 6(7), 7578 (2015).
[Crossref] [PubMed]

Vamivakas, A. N.

C. Chakraborty, L. Kinnischtzke, K. M. Goodfellow, R. Beams, and A. N. Vamivakas, “Voltage-controlled quantum light from an atomically thin semiconductor,” Nature Nanotech. 10(6), 507–511 (2015).
[Crossref]

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Veuillen, J.-Y.

M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
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T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
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Wang, G.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
[Crossref] [PubMed]

Wei, Y.-J.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Weigand, R.

J. Seufert, R. Weigand, G. Bacher, T. Kümmell, A. Forchel, K. Leonardi, and D. Hommel, “Spectral diffusion of the exciton transition in a single self-organized quantum dot,” Appl. Phys. Lett. 76(14), 1872–1874 (2000).
[Crossref]

Wu, S.

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Wysmolek, A.

B. Pietka, J. Suffczynski, M. Goryca, T. Kazimierczuk, A. Golnik, P. Kossacki, A. Wysmolek, J. A. Gaj, R. Stepniewski, and M. Potemski, “Photon correlation studies of charge variation in a single GaAlAs quantum dot,” Phys. Rev. B 87(3), 035310 (2013)
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X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
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H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
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Xu, X.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
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X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
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D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
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K. De Greve, S. Clark, D. Sleiter, K. Sanaka, T. Ladd, M. Panfilova, A. Pawlis, K. Lischka, and Y. Yamamoto, “Photon antibunching and magnetospectroscopy of a single fluorine donor in ZnSe,” Appl. Phys. Lett. 97(24), 241913 (2010).
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
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Yao, W.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

X. Xu, W. Yao, D. Xiao, and T. F. Heinz, “Spin and pseudospins in layered transition metal dichalcogenides,” Nature Phys. 10(5), 343–350 (2014).
[Crossref]

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

D. Xiao, G. B. Liu, W. Feng, X. Xu, and W. Yao, “Coupled spin and valley physics in monolayers of MoS2 and other Group-VI dichalcogenides,” Phys. Rev. Lett. 108(19), 196802 (2012).
[Crossref] [PubMed]

H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
[Crossref]

Ye, H.

T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
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X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Zeng, H.

H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
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Zhang, L.

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

Zhang, Q.

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
[Crossref]

Zhang, X. X.

X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
[Crossref]

Zhao, B.

A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
[Crossref]

Zhao, S. Y. F.

X. X. Zhang, Y. You, S. Y. F. Zhao, and T. F. Heinz, “Experimental Evidence for Dark Excitons in Monolayer WSe2,” Phys. Rev. Lett. 115(25), 257403 (2015)
[Crossref]

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T. Cao, G. Wang, W. Han, H. Ye, C. Zhu, J. Shi, Q. Niu, P. Tan, E. Wang, B. Liu, and J. Feng, “Valley-selective circular dichroism of monolayer molybdenum disulphide,” Nat. Commun. 3(6), 887 (2012).
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S. Kumar, A. Kaczmarczyk, and B. D. Gerardot, “Strain-induced spatial and spectral isolation of quantum emitters in mono-and bi-layer WSe2,” Nano Lett. 15(11), 7567–7573(2015).
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H. Zeng, J. Dai, W. Yao, D. Xiao, and X. Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nature Nanotech. 7(8), 490–493 (2012).
[Crossref]

Y.-M. He, G. Clark, J. R. Schaibley, Y. He, M.-C. Chen, Y.-J. Wei, X. Ding, Q. Zhang, W. Yao, X. Xu, C.-Y. Lu, and J.-W. Pan, “Single quantum emitters in monolayer semiconductors,” Nature Nanotech. 10(6), 497–502 (2015).
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M. Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.-Y. Veuillen, J. Marcus, P. Kossacki, and M. Potemski, “Single photon emitters in exfoliated WSe2 structures,” Nature Nanotech. 10(6), 503–506 (2015).
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A. Srivastava, M. Sidler, A. V. Allain, D. S. Lembke, A. Kis, and A. Imamoğlu, “Optically active quantum dots in monolayer WSe2,” Nature Nanotech. 10(6), 491–496 (2015).
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A. M. Jones, H. Yu, N. J. Ghimire, S. Wu, G. Aivazian, J. S. Ross, B. Zhao, J. Yan, D. G. Mandrus, D. Xiao, W. Yao, and X. Xu, “Optical generation of excitonic valley coherence in monolayer WSe2,” Nature Nanotech. 8(9), 634–638 (2013).
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K. F. Mak, K. He, J. Shan, and T. F. Heinz, “Control of valley polarization in monolayer MoS2 by optical helicity,” Nature Nanotech. 7(8), 494–498 (2012).
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Science (1)

P. Michler, A. Kiraz, C. Becher, W. V. Schoenfeld, P. M. Petroff, L. Zhang, E. Hu, and A. Imamoglu, “A quantum dot single-photon turnstile device,” Science 290(5500), 2282–2285 (2000).
[Crossref] [PubMed]

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Figures (5)

Fig. 1
Fig. 1 (a) Optical image of an exfoliated flake on top of the Si/SiO2 substrate. (b) Photoluminescence spectrum from localized emitters. The inset is a high resolution spectrum of the highly redshift peak (SQEA). The data was recorded at a nominal temperature of 4.2 K.
Fig. 2
Fig. 2 (a) Spectral wandering of the SQEA as a function of photon energy and frames. (b) The integrated counts of the photon emission from SQEA showing the onset of a characteristic saturation behavior with increasing laser power. The red line is the saturation curve fit. (c) Linewidth of the SQEA as a function of the excitation power.
Fig. 3
Fig. 3 (a) and (c) Temperature-dependent photoluminescence spectra of SQEA and SQEB. The linewidths broaden when the temperature is increased. (b) and (d) Extracted linewidth as a function of the temperature. The red lines are fitted by Eq. (2).
Fig. 4
Fig. 4 (a) and (b) Integrated intensity as a function of temperature for SQEA and SQEB. The decrease of the intensity at high temperature is observed. The change in the slope is around 20 K and 10 K, respectively. The red lines are fitted by Eq. (3).
Fig. 5
Fig. 5 (a) Time resolved PL of SQEA. The black line decay is bi-exponential at 24 K with the long decay time 3.65 ns. The red line is mono-exponential at 41 K with the decay time 1.39 ns. (b) Decay rates of SQEA increase as a function of the temperature. The change of the slope is around 20 K. The red line is fitted by Eq. (4).

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

I ( P ) = I max 1 1 + P 0 P
γ ( T ) = γ 0 + γ ac * T + γ LO e E LO k T 1
I ( T ) = I 0 1 + A 1 e E 1 k T + A 2 e E 2 k T
T 2 1 = Γ bright + Γ dark 2 Γ bright Γ dark 2 tanh Δ E 2 k B T

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