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Terahertz dynamics of topological insulator Bi2Se3 : ultrafast photoexcitation suppresses hot-Dirac electron surface scattering

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Abstract

We present ultrafast terahertz scattering dynamics in topological insulator Bi2Se3 thin films. Upon photoexcitation, the surface-scattering rate is increased, resulting in decrease of conductance. At high temperature, however, the photo-generated electrons suppress the surface-scattering.

© 2014 Optical Society of America

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