Abstract

The polarization dependence of quantum beats from the A-exciton and the B-exciton in a GaN sample of exceptional quality is studied with four-wave mixing experiments. When changing the incident polarizations from collinear to crossed linear, a π-phase shift of the beats is observed while the decay rate remains unchanged. This confirms previous theoretical predictions.

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References

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  1. S. Schmitt-Rink, D. Bennhardt, V. Heuckeroth, P. Thomas, P. Haring, G. Maidorn, H. Bakker, K. Leo, D. Kim, J. Shah, and K. Kohler, "Polarization dependence of heavy- and light-hole quantum beats" Phys. Rev. B 46, 10460-10463 (1992).
    [CrossRef]
  2. T. Saiki, M. Kuwata-Gonokami, T. Matsusue, and H. Sakaki, "Photon echo induced by two-exciton coherence in a GaAs quantum well" Phys. Rev. B 49, 7817-7820 (1994).
    [CrossRef]
  3. T.F. Albrecht, K. Bott, A. Schulze, M. Koch, S.T. Cundi, J. Feldmann, W. Stolz, P. Thomas, S. W. Koch, and E. O. Gobel, "Disorder mediated biexcitonic beats in semiconductor quantum wells" Phys. Rev. B 54, 4436-4439 (1996).
    [CrossRef]
  4. T. Saiki, M. Kuwata-Gonokami, K. Ohkawa, and T. Mitsuyu, "Role of biexciton state in excitonic resonant nonlinearity in homoepitaxial ZnSe" Solid State Commun. 95, 679-683 (1995).
    [CrossRef]
  5. D. Weber, W. Petri, U. Woggon, C.F. Klingshirn, S. Shevel, and E.O. Gobel, "Quantum beats of polaritons in hexagonal CdS crystals" Phys. Rev. B 55, 12848-12851 (1997).
    [CrossRef]
  6. R. Zimmermann, M.R. Hofmann, A. Euteneuer, J. Mobius, D. Weber, W.W. Ruhle, E.O. Gobel, B.K. Meyer, H. Amano, and I. Akasaki, "Quantum beat spectroscopy on excitons in GaN" ICAM'97/E-MRS'97, Strasbourg(1997), L-XII.3.
  7. A.J. Fischer, W. Shan, G.H. Park, J.J. Song, D.S. Kim, D.S. Yee, R. Horning, and B. Goldenberg, "Femtosecond four-wave-mixing studies of nearly homogeneously broadened excitons in GaN" Phys. Rev. B 56, 1077-1080 (1997).
    [CrossRef]
  8. A. Usui, H. Sunakawa, A. Sakai, and A.A. Yamaguchi, "Thick GaN Epitaxial Growth with Low Dislocation Density by Hydride Vapor Phase Epitaxy" Jpn. J. Appl. Phys. 36, L899-L902 (1997).
    [CrossRef]
  9. T. Yajima and Y. Taira, "Spatial optical parametric coupling of picosecond light pulses and transverse relaxation eect in resonant media" J.Phys. Soc. Jpn.47, 1620-1623 (1979).
    [CrossRef]

Other (9)

S. Schmitt-Rink, D. Bennhardt, V. Heuckeroth, P. Thomas, P. Haring, G. Maidorn, H. Bakker, K. Leo, D. Kim, J. Shah, and K. Kohler, "Polarization dependence of heavy- and light-hole quantum beats" Phys. Rev. B 46, 10460-10463 (1992).
[CrossRef]

T. Saiki, M. Kuwata-Gonokami, T. Matsusue, and H. Sakaki, "Photon echo induced by two-exciton coherence in a GaAs quantum well" Phys. Rev. B 49, 7817-7820 (1994).
[CrossRef]

T.F. Albrecht, K. Bott, A. Schulze, M. Koch, S.T. Cundi, J. Feldmann, W. Stolz, P. Thomas, S. W. Koch, and E. O. Gobel, "Disorder mediated biexcitonic beats in semiconductor quantum wells" Phys. Rev. B 54, 4436-4439 (1996).
[CrossRef]

T. Saiki, M. Kuwata-Gonokami, K. Ohkawa, and T. Mitsuyu, "Role of biexciton state in excitonic resonant nonlinearity in homoepitaxial ZnSe" Solid State Commun. 95, 679-683 (1995).
[CrossRef]

D. Weber, W. Petri, U. Woggon, C.F. Klingshirn, S. Shevel, and E.O. Gobel, "Quantum beats of polaritons in hexagonal CdS crystals" Phys. Rev. B 55, 12848-12851 (1997).
[CrossRef]

R. Zimmermann, M.R. Hofmann, A. Euteneuer, J. Mobius, D. Weber, W.W. Ruhle, E.O. Gobel, B.K. Meyer, H. Amano, and I. Akasaki, "Quantum beat spectroscopy on excitons in GaN" ICAM'97/E-MRS'97, Strasbourg(1997), L-XII.3.

A.J. Fischer, W. Shan, G.H. Park, J.J. Song, D.S. Kim, D.S. Yee, R. Horning, and B. Goldenberg, "Femtosecond four-wave-mixing studies of nearly homogeneously broadened excitons in GaN" Phys. Rev. B 56, 1077-1080 (1997).
[CrossRef]

A. Usui, H. Sunakawa, A. Sakai, and A.A. Yamaguchi, "Thick GaN Epitaxial Growth with Low Dislocation Density by Hydride Vapor Phase Epitaxy" Jpn. J. Appl. Phys. 36, L899-L902 (1997).
[CrossRef]

T. Yajima and Y. Taira, "Spatial optical parametric coupling of picosecond light pulses and transverse relaxation eect in resonant media" J.Phys. Soc. Jpn.47, 1620-1623 (1979).
[CrossRef]

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Figures (2)

Fig. 1.
Fig. 1.

(a) The reflection spectrum of our GaN sample. Each label for a resonance indicates the corresponding transition. (b) The laser spectrum as used for excitation in the FWM experiments.

Fig. 2.
Fig. 2.

The FWM signals in the direction 2k 1 - k 2 as a function of time delay τ between the pulse k 1 and pulse k 2 for collinear (a) and crossed linear (b) incident polarizations. Positive time delay is defined as pulse k 2 arriving first.

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