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Ultrafast Conductivity Study of Dirac Surface States via THz Pump and THz Probe Spectroscopy

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Abstract

Intense THz excitation in topological insulator Bi2Se3 induces negative low-frequency conductivity and energy-dependent relaxation dynamics, different from high-energy pumping, which allows us to isolate intrinsic quasi-particle scattering dynamics inside the surface states.

© 2016 Optical Society of America

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