Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Transport: Topological Insulators 2 (jointly with DS, HL, MA, O)
TT 32.5: Vortrag
Dienstag, 17. März 2015, 10:30–10:45, H 3005
Weak Antilocalization of 3DTI Surface States in the Presence of Spin-Orbit Impurities — •Pierre Adroguer1, Weizhe Liu2, Dimitrie Culcer2 und Ewelina Hankiewicz1 — 1Institut füt Theoretische Physik und Astrophysik, Universität Würzburg, Deutschland — 2School of Physics, The University of New South Wales, Sydney, Australia
The recent realization of three dimensional topological insulators (3DTIs) allows to probe the coherent transport of Dirac systems. In the presence of scalar disorder, weak antilocalization (WAL) is observed. However, TIs are materials where spin-orbit plays a crucial role, and the effect of spin-orbit impurities on coherent transport had not be studied yet.
In conventional electron gases where electrons have a parabolic dispersion, the concentration of spin-orbit impurities is of significative importance. Indeed, when the concentration of spin-orbit impurities is increased, the sign of the quantum correction to conductivity changes, going from weak localization to weak antilocalization (WAL).
In this work, we derive with the standard diagrammatic technique the quantum correction to conductivity when we add spin-orbit impurities to the diffusion of Dirac fermions in a disordered potential. We show that for every concentration of the spin-orbit impurities we remain in the symplectic class of WAL. We also derive the value of this quantum correction to conductivity in the presence of a transverse magnetic field, and we show that fits with the conventional theory have to be revisited in the view of our results.