Speaker
Andrei Pimenov
(Vienna University of Technology)
Description
A. M. Shuvaev(1), G. V. Astakhov (2), G. Tkachov (3), C. Brüne (3)
H. Buhmann (3), L. W. Molenkamp (3), A. Pimenov (1)
(1) Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
(2) Physikalisches Institut (EP6), Universität Würzburg, 97074 Würzburg, Germany
(3) Physikalisches Institut (EP3), UniversitÄat Würzburg, 97074 Würzburg, Germany
Using terahertz spectroscopy in external magnetic felds we investigate the low-temperature charge dynamics of the topological insulator HgTe. Faraday rotation angle and ellipticity could be well described using a classical Drude model in two dimensions (2D). From these data complete
characterization of the charge carriers could be done, including 2D density, scattering rate and cyclotron effective mass. In these experiments the quantum Hall oscillations are observed at terahertz frequencies. The two-dimensional density, estimated from the period of the oscillations,
agrees well with direct transport experiments. The effective mass of the 2D carriers is found to be close to that in the bulk of the unstrained sample.
Primary author
Andrei Pimenov
(Vienna University of Technology)
