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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Tuesday, 21 November 2013
(at 13:00 in room HAL 115)
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Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire

Joseph Dufouleur

IFW Dresden

Quantum coherent transport of Dirac fermions in a mesoscopic nanowire of the 3D topological insulator Bi2Se3 is studied in the weak-disorder limit. At very low temperatures, the Fourier transform of Aharonov-Bohm (A-B) oscillations reveals the long phase coherence length of surface states. Remarkably, from the exponential temperature dependence of the A-B oscillations, we infer an unusual 1/T power law for the phase coherence length. This typical temperature dependence indicates the weak coupling of the fermions to the dynamics of their environment and evidences a quasi-ballistic transport regime of spin-chiral Dirac fermions over the perimeter of the Bi2Se3 nanowire (240 nm). This is a signature of the weakening of the transport scattering time for spin-chiral fermions [1].

[1] Dufouleur et al., Physical Review Letters 110, 186806 (2013)

Brief Bio:

2003-2007: PhD thesis at the Laboratory for Photonic and Nanostructures, CNRS (France)
2007-2008: Post Doc at the CEA/SPEC in Glattli Group (Saclay, France)
2008-2010: Post Doc at the Walter Schottky Institute (Garching, Germany)
2011- : Preparation of the habilitation at the Institute of Solid State Research – IFW Dresden

Announcement (pdf)

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.02 Sat
author: webadmin