Interaction Effects on Quasiparticle Localization in Dirty Superconductors

Details Interaction Effects on Quasiparticle Localization in Dirty Superconductors Interaction Effects on Quasiparticle Localization in Dirty Superconductors

2001-12-04

arxiv.org/abs/cond-mat/0112044v1

Physics

Condensed Matter

Superconductivity

5 pages, Bull. Am. Phys. Soc. 46, 231 (2001)

Scientific paper

We study how quasiparticle interactions affect their localization properties in dirty superconductors with broken time reversal symmetry -- for example in a magnetic field. For SU(2) spin-rotation invariant (class C) systems, the only important coupling is the spin-spin triplet interaction, which we study within a renormalization group approach. Either an additional Zeeman coupling or a complete breaking of spin rotation symmetry renders all interactions irrelevant. These two situations realize, respectively, the non-interacting unitary Anderson and the ``thermal'' (class D) universality class. Our results imply a stable metallic phase in 2D for class D. Experimental implications are discussed.

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