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Room-Temperature High-Frequency Transport of Dirac Fermions in Epitaxially Grown Sb2Te3- and Bi2Te3-Based Topological Insulators

Olbrich, P. ; Golub, L. E. ; Herrmann, T. ; Danilov, S. N. ; Plank, H. ; Bel'kov, V. V. ; Mussler, G. ; Weyrich, Ch. ; Schneider, C. M. ; Kampmeier, J. ; Grützmacher, D. ; Plucinski, L. ; Eschbach, M. ; Ganichev, Sergey


We report on the observation of photogalvanic effects in epitaxially grown Sb2Te3 and Bi2Te3 three-dimensional (3D) topological insulators (TI). We show that asymmetric scattering of Dirac fermions driven back and forth by the terahertz electric field results in a dc electric current. Because of the “symmetry filtration” the dc current is generated by the surface electrons only and provides an ...


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