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Interaction Effects on Quasiparticle Localization in Dirty Superconductors

M. Jeng·A. W. W. Ludwig·T. Senthil·C. Chamon
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Abstract

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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M. Jeng, A. W. W. Ludwig, T. Senthil, C. Chamon. 2001-12-04. Interaction Effects on Quasiparticle Localization in Dirty Superconductors. https://arxiv.org/abs/cond-mat/0112044

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