Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic-field switchable metal-insulator transitions in a quasi-helical
  conductor   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 (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
pseudo-gap. We investigate these transitions using a unified two-step
renormalization group approach.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph