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

J. T. Chalker; N. Read; V. Kagalovsky; B. Horovitz; Y. Avishai; A. W. W. Ludwig

doi:10.1103/PhysRevB.65.012506

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

J. T. Chalker, N. Read, V. Kagalovsky, B. Horovitz, Y. Avishai, A. W. W. Ludwig

DOI 10.1103/PhysRevB.65.012506 · Physical Review B

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Abstract

We study the symmetry class for localization which arises from models of noninteracting quasiparticles in disordered superconductors that have neither time-reversal nor spin-rotation invariance. 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 show the appearance of the metallic phase.