Universality of delocalization in unconventional dirty superconducting wires with broken spin-rotation symmetry

Details Universality of delocalization in unconventional dirty superconducting wires with broken spin-rotation symmetry Universality of delocalization in unconventional dirty superconducting wires with broken spin-rotation symmetry

2002-02-21

arxiv.org/abs/cond-mat/0202365v2

Phys. Rev. B 67, 014530 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, published version

Scientific paper

10.1103/PhysRevB.67.014530

In dirty superconducting wires, quasiparticle states at the Fermi level need not be exponentially localized if spin-rotation symmetry is broken [Brouwer {\em et al.}, Phys. Rev. Lett. {\bf 85}, 1064 (2000)]. Here we present evidence that not-localized states are generic in the thick-wire limit, while for wires of finite thickness delocalization requires fine tuning of the disorder, consistent with earlier results of Motrunich {\em et al.} [Phys. Rev. B {\bf 63}, 224204 (2001)]. The thick-wire limit is defined as the simultaneous limit where the length $L$ of the wire and the number $N$ of propagating channels at the Fermi energy are both taken to infinity with their ratio held fixed.

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