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| 演 題 | 「THz-APRES band structure movies of Dirac surface currents」 |
|---|---|
| 日 時 | 2019年11月12日(火) 16:00 |
| 講演者 | Ulrich Höfer 教授（Department of Physics, Philipps-University of Marburg, Germany） |
| 場 所 | 分子科学研究所 研究棟201 |
| 概 要 |
Time-resolved photoelectron spectroscopy combines femtosecond pump-probe techniques with angle-resolved photoelectron spectroscopy (ARPES). New opportunities for this powerful technique arise in combination with THz excitation. As an example, I will explain how THz-ARPES can be used to measure electron transport in the Dirac surface state of a three-dimensional topological insulator in a contact-free fashion and with femtosecond time-resolution. We induce electrical currents in these states with strong THz transients and directly access their dynamics in momentum space with subcycle time resolution. As a result of spin-momentum locking, the accelerated spin-polarized electrons reach ballistic mean free paths of several hundreds of nanometers. Topological insulators are thus promising materials for future lightwave- driven electronics [1]. |
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