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Quantum coherent transport of Dirac fermions in a mesoscopic nanowire of the3D topological insulator Bi2Se3 is studied in the weak-disorder limit. At verylow temperatures, many harmonics are evidenced in the Fourier transform ofAharonov-Bohm oscillations, revealing the long phase-coherence length ofsurface states. Remarkably, from their exponential temperature dependence, weinfer an unusual 1/T power law for the phase coherence length. This decoherenceis typical for quasi-ballistic fermions weakly coupled to the dynamics of theirenvironment.

Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire