Thursday, 7 February 2013

Surface State Charge Dynamics of a High-Mobility Three-Dimensional Topological Insulator

Jason N. Hancock1, J. L. M. van Mechelen1, Alexey B. Kuzmenko1, Dirk van der Marel1, Christoph Brüne2, Elena G. Novik2, Georgy V. Astakhov2, Hartmut Buhmann2, and Laurens W. Molenkamp2
1Département de Physique de la Matière Condensée, Université de Genève, quai Ernest-Ansermet 24, CH 1211 Genève 4, Switzerland
2Physikalisches Institut der Universität Würzburg - 97074 Würzburg, Germany

DOI: 10.1103/PhysRevLett.107.136803
PACS: 73.25.+i, 03.65.Vf, 73.20.Mf, 78.20.Ls

Abstract: We present a magneto-optical study of the three-dimensional topological insulator, strained HgTe, using a technique which capitalizes on advantages of time-domain spectroscopy to amplify the signal from the surface states. This measurement delivers valuable and precise information regarding the surface-state dispersion within <1  meV of the Fermi level. The technique is highly suitable for the pursuit of the topological magnetoelectric effect and axion electrodynamics.
The measurements in this paper were acquired using +TeraView's TPS Spectra 3000. Please visit our webpage on Publications on Terahertz Technology to view or download more papers.