Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: Transport: Topological insulators 2 (TT with HL/DS)
HL 28.10: Vortrag
Dienstag, 17. März 2015, 12:15–12:30, H 3005
Non-universal conductance fluctuations in 3D topological insulator nanowires. — •Emmanouil Xypakis1, Jens H Bardarson1, Louis Veyrat2, Joseph Dufouleur2, and Romain Giraud2 — 1Max-Planck-Institut fuer Physik Komplexer Systeme, Noethnitzer Straße 38, D-01187 Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany
The topic of this talk is a joint theoretical and experimental study of conductance fluctuations in 3D strong topological insulator nanowires. Specifically, when a nanowire is subjected to a magnetic field and disorder weak enough to be away from the universal diffusive limit, the amplitude of the conductance fluctuations oscillates with respect to the magnetic field along the wire. We explain this oscillatory behaviour by the Dirac nature of the topologically protected surface quasiparticles of the topological insulator. We further demonstrate the robustness of this quasi-ballistic transport regime by a direct comparison with experimental data obtained for Bi2Se3 nanowires.