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.
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 (Presented at SPIE OPTO: February 03, 2020; Published: 10 March 2020); https://doi.org/10.1117/12.2543969.6138743634001.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the proceedings. They include the speaker's narration with video of the slides and animations. Most include full-text papers. Interactive, searchable transcripts and closed captioning are now available for most presentations.
Search our growing collection of more than 27,500 conference presentations, including many plenaries and keynotes.