Surface state charge dynamics of a high-mobility three dimensional topological insulator

Alexey B. Kuzmenko; Cristoph Br\"une; Dirk van der Marel; Elina G. Novik; Georgy V. Astakhov; Hartmut Buhmann; Jason N. Hancock; J. L. M. van Mechelen; Laurens W. Molenkamp

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Surface state charge dynamics of a high-mobility three dimensional topological insulator

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arxiv 1105.0884 v2 pith:SVT2KC22 submitted 2011-05-04 cond-mat.mes-hall cond-mat.mtrl-scicond-mat.str-el

Jason N. Hancock , J. L. M. van Mechelen , Alexey B. Kuzmenko , Dirk van der Marel , Cristoph Brüne , Elina G. Novik , Georgy V. Astakhov , Hartmut Buhmann

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Laurens W. Molenkamp

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classification cond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el

keywords surfacetopologicalinsulatorstatetechniqueadvantagesamplifyaxion

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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.

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