Magnetic-field switchable metal-insulator transitions in a quasihelical conductor

Bernd Braunecker*, Anders Strom, G. I. Japaridze

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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 "quasihelical" because the spins of the counterpropagating modes are not perfectly antiparallel and have a small spin-wave-function 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 quasihelical conductor (with localization length exceeding the system length), and one at a higher field again to a localized state, due now, however, to backscattering below the magnetic-field induced pseudogap. We investigate these transitions using a unified two-step renormalization group approach. DOI: 10.1103/PhysRevB.87.075151

Original languageEnglish
Article number075151
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Issue number7
Publication statusPublished - 28 Feb 2013




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