Article Dans Une Revue Physical Review Letters Année : 2013

Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire

Résumé

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, many harmonics are evidenced in the Fourier transform of Aharonov-Bohm oscillations, revealing the long phase-coherence length of surface states. Remarkably, from their exponential temperature dependence, we infer an unusual 1/T power law for the phase coherence length. This decoherence is typical for quasi-ballistic fermions weakly coupled to the dynamics of their environment.

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hal-00838133 , version 1 (05-03-2018)

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J. Dufouleur, L. Veyrat, A. Teichgräber, S. Neuhaus, C. Nowka, et al.. Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire. Physical Review Letters, 2013, 110 (18), pp.186806 (1-5). ⟨10.1103/PhysRevLett.110.186806⟩. ⟨hal-00838133⟩
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