Critical fixed points in class D superconductors
Victor Kagalovsky, Demitry Nemirovsky
DOI 10.1103/PhysRevB.81.033406 · Physical Review B
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Abstract
We study in detail a critical line on the phase diagram of the Cho-Fisher network model separating three different phases: metallic and two distinct localized phases with different quantized thermal Hall conductances. This system describes noninteracting quasiparticles in disordered superconductors that have neither time-reversal nor spin-rotational invariance. We find that in addition to a tricritical fixed point WT on the critical line, separating two localized phases, there exists an additional repulsive fixed point WN (where the vortex disorder concentration WN<WT), which splits RG flow into opposite directions: toward a clean Ising model at W=0 and toward WT.
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