Regensburg 2019 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.31: Poster
Dienstag, 2. April 2019, 17:00–20:00, Poster E
Superradiant and transport lifetimes of the cyclotron resonance in the topological insulator HgTe — •Jan Gospodaric1, Vlad Dziom1, Alexey Shuvaev1, Andrei Pimenov1, Alena Dobretsova2, Nikolay Nikolaevich Mikhailov2, and Ze Don Kvon2 — 1Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — 2Rzhanov Institute of Semiconductor Physics and Novosibirsk State University, Novosibirsk 630090, Russia
In this work, we investigated the phenomenon of collective radiative decay, or superradiance, in three-dimensional topological insulator HgTe with conducting surface states. Specifically, by utilizing an approach of a continuous-wave spectroscopy we examined the cyclotron resonance of the surface electrons in the terahertz frequency range. Due to the quasi-classical regime of the cyclotron resonance at terahertz frequencies, the results can be well explained via classical electrodynamic approach. This allowed us to separate the energy losses in the system into intrinsic and radiation losses, respectively. We showed experimentally that a semi-transparent gate on the top of HgTe quantum well allows us to switch the sample to a regime where the superradiance, i.e. coherent emission, dominates the losses.