title: Enhanced Mobility of Spin-Helical Dirac Fermions in Disordered 3D Topological Insulators.
abstract: The transport length ltrand the mean free path leare determined for bulk and surface states in a Bi2Se3nanoribbon by quantum transport and transconductance measurements. We show that the anisotropic scattering of spin-helical Dirac fermions results in a strong enhancement of ltr(≈ 200 nm) and of the related mobility μtr(≈ 4000 cm2V-1s-1), which confirms theoretical predictions.1 Despite strong disorder, the long-range nature of the scattering potential gives a large ratio ltr/le≈ 8, likely limited by bulk/surface coupling. This suggests that the spin-flip length lsf≈ ltrcould reach the micron size in materials with a reduced bulk doping and paves the way for building functionalized spintronic and ballistic electronic devices out of disordered 3D topological insulators.
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Joseph
authors.initials: J
authors.lastname: Dufouleur
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Louis
authors.initials: L
authors.lastname: Veyrat
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Bastien
authors.initials: B
authors.lastname: Dassonneville
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Nowka
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Silke
authors.initials: S
authors.lastname: Hampel
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Pavel
authors.initials: P
authors.lastname: Leksin
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Barbara
authors.initials: B
authors.lastname: Eichler
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Schmidt
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Büchner
authors.affiliation: IFW Dresden , P.O. Box 270116, D-01171 Dresden, Germany.|INAC-SPINTEC, Univ. Grenoble Alpes/CNRS/CEA , 17 Avenue des Martyrs, 38054 Grenoble, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Giraud
keywords: Topological insulators; anisotropic scattering; chemical vapor transport nanostructures; gate effect; quantum transport