Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 53: Topological Insulators: Transport (HL with DS/MA/O/TT)
O 53.2: Talk
Wednesday, March 18, 2015, 12:00–12:15, ER 270
Aharonov-Bohm oscillations in quantum wire of topological insulator — •Louis Veyrat1, Joseph Dufouleur1, Romain Giraud1, Emmanouil Xypakis2, Jens Bardarson2, Christian Nowka1, Silke Hampel1, and Bernd Büchner1 — 1IFW-Dresden — 2MPIPKS
Studying Aharonov-Bohm (AB) effect in a nanowire of topological insulator is a convenient way to reveal the specific properties of the topological surface states (SS), which are spin-chiral Dirac fermions. In the short perimeter limit, we evidenced in a previous work the ballistic transport of the SS in the perimeter of the nanowire, revealed by the temperature dependance of the phase coherence length [1] and showing the weak scattering effect of disorder on Dirac fermions. The quantum transverse confinement of SS is further revealed by the observation of non-universal conductance fluctuations. In the longer perimeter limit, we surprisingly find that the transport remains ballistic in the perimeter, despite the presence of disorder. The interaction with disorder is revealed by specific phase-jump of the AB oscillations under transverse magnetic field.
[1] Dufouleur et al., Phys. Rev. Lett. 110, 186806 (2013)