Interaction Effects on Quasiparticle Localization in Dirty Superconductors
Superconductivity
2007-05-23 v1
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.
Cite
@article{arxiv.cond-mat/0112044,
title = {Interaction Effects on Quasiparticle Localization in Dirty Superconductors},
author = {M. Jeng and A. W. W. Ludwig and T. Senthil and C. Chamon},
journal= {arXiv preprint arXiv:cond-mat/0112044},
year = {2007}
}
Comments
5 pages, Bull. Am. Phys. Soc. 46, 231 (2001)