Magnetic-field switchable metal-insulator transition in a quasi-helical conductor

Braunecker, Bernd and Stroem, Anders and Japaridze, G.I. (2013) Magnetic-field switchable metal-insulator transition in a quasi-helical conductor. Physical Review B, 87 (7). 075151-075155.


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We study Anderson localization in disordered helical conductors that are obtained from one-dimensional conductors with spin-orbit interaction and a magnetic field, or from equivalent systems. We call such conductors ``quasi-helical'' because the spins of the counterpropagating modes are not perfectly antiparallel and have a small spin-wavefunction overlap that is tunable by the magnetic field. Due to the overlap, disorder backscattering is possible and allows a localization transition. A conductor can pass through two localization transitions with increasing field, one from the conventionally localized system to the quasi-helical conductor, and one at a higher field again to a localized state, due now, however, to backscattering below the magnetic field induced pseudo-gap. We investigate these transitions using a unified 2-step renormalization group approach.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties/Schools > School of Natural Sciences and Engineering
Depositing User: გიორგი ჯაფარიძე
Date Deposited: 30 Jan 2014 20:02
Last Modified: 03 Apr 2015 06:20

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