Quasiballistic transport of Dirac fermions in a Bi2Se3 nanowire

Quantum coherent transport of surface states in a mesoscopic nanowire of the three-dimensional topological insulator Bi(2}Se(3) is studied in the weak-disorder limit. At very low temperatures, many harmonics are evidenced in the Fourier transform of Aharonov-Bohm oscillations, revealing the long pha...

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Published inPhysical review letters Vol. 110; no. 18; p. 186806
Main Authors Dufouleur, J, Veyrat, L, Teichgräber, A, Neuhaus, S, Nowka, C, Hampel, S, Cayssol, J, Schumann, J, Eichler, B, Schmidt, O G, Büchner, B, Giraud, R
Format Journal Article
LanguageEnglish
Published United States 03.05.2013
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Summary:Quantum coherent transport of surface states in a mesoscopic nanowire of the three-dimensional topological insulator Bi(2}Se(3) is studied in the weak-disorder limit. At very low temperatures, many harmonics are evidenced in the Fourier transform of Aharonov-Bohm oscillations, revealing the long phase coherence length of spin-chiral Dirac fermions. Remarkably, from their exponential temperature dependence, we infer an unusual 1/T power law for the phase coherence length L(φ)(T). This decoherence is typical for quasiballistic fermions weakly coupled to their environment.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.110.186806