Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: Topological insulators: mostly structure and electronic structure (with MA/O/TT)

HL 2.10: Vortrag

Montag, 31. März 2014, 12:00–12:15, POT 051

Transport of Dirac fermions in the presence of spin-orbit impurities — •Pierre Adroguer1, Dimitri Culcer2, and Ewelina Hankiewicz11Institute for Theoretical Physics and Astronomy, Würzburg University, Würzburg, Germany — 2School of Physics, University of New South Wales, Sidney, Australia

The recent exprimental realizations of three dimensional topological insulators (3DTI) have provided a new tool to investigate Dirac physics.

Indeed, these materials exhibit an insulating bulk and a single metallic surface state described by Dirac fermion physics.

In the regime of weak scalar disorder, Dirac fermions do not backscatter because of time-reversal symmetry. Further, this absence of backscattering leads to a weak antilocalization correction (an increase in conductivity in the absence of magnetic field, due to quantum interference of conjugated paths) [1,2].

In this presentation, we will review these phenomena, and show how these features are modified when there are spin-orbit impurities in the Dirac fermion systems.

We acknowledge financial support via grant HA 5893/4-1 within SPP 1666.

[1] G. Tkachov and E. M. Hankiewicz, Phys. Rev. B 84, 035444 (2011)

[2] P. Adroguer, D. Carpentier, J. Cayssol, and E. Orignac, New Journal of Physics 14, 103027 (2012)

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