Thermal metal in network models of a disordered two-dimensional superconductor

Details Thermal metal in network models of a disordered two-dimensional superconductor Thermal metal in network models of a disordered two-dimensional superconductor

2000-09-29

arxiv.org/abs/cond-mat/0009463v1

Phys. Rev. B65, 012506 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.012506

We study the universality class for localization which arises from models of non-interacting quasiparticles in disordered superconductors that have neither time-reversal nor spin-rotation symmetries. Two-dimensional systems in this category, which is known as class D, can display phases with three different types of quasiparticle dynamics: metallic, localized, or with a quantized (thermal) Hall conductance. Correspondingly, they can show a variety of delocalization transitions. We illustrate this behavior by investigating numerically the phase diagrams of network models with the appropriate symmetry, and for the first time show the appearance of the metallic phase.

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