Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire
  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. 
J. Dufouleur, L. Veyrat, A. Teichgraeber, S. Neuhaus, C. Nowka, S.   Hampel, J. Cayssol, J. Schumann, B. Eichler, O. Schmidt...
cond-mat.mes-hall