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10 March 2020 2D THz spectroscopic investigation of ballistic conduction-band electron dynamics in InSb (Conference Presentation)
Sarah Houver, Lucas Huber, Matteo Savoini, Elsa Abreu, Steven L. Johnson
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Proceedings Volume 11278, Ultrafast Phenomena and Nanophotonics XXIV; 112780O (2020) https://doi.org/10.1117/12.2543969
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
In semiconductors and semimetals, strong THz electric fields can induce a controlled coherent motion of the electrons in the conduction band, via ballistic excitation. In the first picoseconds after THz excitation, the nonlinearities induced by this coherent excitation prevail before more incoherent high field effects start dominating the nonlinear response. Disentangling these different nonlinear contributions with 2D THz spectroscopy, we follow the trajectory of the out-of-equilibrium electron population in low-bandgap semiconductor InSb and. We then extract information on the conduction band curvature and evaluate its anharmonicity and its anisotropy, close to the Gamma-point.
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Sarah Houver, Lucas Huber, Matteo Savoini, Elsa Abreu, and Steven L. Johnson "2D THz spectroscopic investigation of ballistic conduction-band electron dynamics in InSb (Conference Presentation)", Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 112780O (10 March 2020); https://doi.org/10.1117/12.2543969
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KEYWORDS
Terahertz radiation
Spectroscopy
Nonlinear response
Finite-difference time-domain method
Anisotropy
Feature extraction
Ionization
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