title: Quasiballistic transport of Dirac fermions in a Bi2Se3 nanowire.
abstract: 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.
authors.affiliation: Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany. j.dufouleur@ifw-dresden.de
authors.forename: J
authors.initials: J
authors.lastname: Dufouleur
authors.forename: L
authors.initials: L
authors.lastname: Veyrat
authors.forename: A
authors.initials: A
authors.lastname: Teichgräber
authors.forename: S
authors.initials: S
authors.lastname: Neuhaus
authors.forename: C
authors.initials: C
authors.lastname: Nowka
authors.forename: S
authors.initials: S
authors.lastname: Hampel
authors.forename: J
authors.initials: J
authors.lastname: Cayssol
authors.forename: J
authors.initials: J
authors.lastname: Schumann
authors.forename: B
authors.initials: B
authors.lastname: Eichler
authors.forename: O G
authors.initials: OG
authors.lastname: Schmidt
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: R
authors.initials: R
authors.lastname: Giraud