期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.186806
关键词
-
资金
- EU/FP7 [TEMSSOC]
- ANR [2010-BLANC-041902]
Quantum coherent transport of surface states in a mesoscopic nanowire of the three-dimensional 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 spin-chiral Dirac fermions. Remarkably, from their exponential temperature dependence, we infer an unusual 1/T power law for the phase coherence length L-phi(T). This decoherence is typical for quasiballistic fermions weakly coupled to their environment.
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