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Photogalvanic probing of helical edge channels in two-dimensional HgTe topological insulators

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Dantscher, Kathrin-Maria ; Kozlov, D. A. ; Scherr, M.-T. ; Gebert, Sebastian ; Bärenfänger, Jan ; Durnev, M. V. ; Tarasenko, Sergey ; Belkov, Vassilij ; Mikhailov, N. N. ; Dvoretsky, S. A. ; Kvon, Z. D. ; Ziegler, Johannes ; Weiss, Dieter ; Ganichev, Sergey
Date of publication of this fulltext: 20 Jun 2017 07:39


We report on the observation of a circular photogalvanic current excited by terahertz laser radiation in helical edge channels of two-dimensional (2D) HgTe topological insulators (TIs). The direction of the photocurrent reverses by switching the radiation polarization from a right-handed to a left-handed one and, for fixed photon helicity, is opposite for the opposite edges. The photocurrent is ...


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