Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.40: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Edge transport and backscattering in a two-dimensional topological insulator in strong magnetic fields — •G. Tkachov and E. M. Hankiewicz — Würzburg University, Germany

Unlike ordinary band insulators, a recently identified class of materials - topological insulators - exhibit unusual conducting states on sample boundaries. Recently, a large body of experimental and theoretical work has been devoted to detection and characterization of such states in topological insulators (see, e.g. Refs. [1,2]). In this work we discuss how the edge states in a two-dimensional topological insulator can be probed by means of quasiballistic transport in strong magnetic fields. We find in particular that defects, which cause edge-state backscattering, can generate strong energy and magnetic- field dependences of the longitudinal conductance [3].
M. König, H. Buhmann, L. W. Molenkamp, T. Hughes, C.-X. Liu, X.-L. Qi, and S.-C. Zhang, J. Phys. Soc. Jpn. 77, 031007 (2008).
M. Z. Hasan and C. L. Kane, Rev. Mod. Phys. 82, 3045 (2010).
G. Tkachov and E. M. Hankiewicz, Phys. Rev. Lett. 104, 166803 (2010).