Griffiths phase in the thermal quantum Hall effect

Details Griffiths phase in the thermal quantum Hall effect Griffiths phase in the thermal quantum Hall effect

2005-03-29

arxiv.org/abs/cond-mat/0503679v1

Phys. Rev. B 73, 121301 (R) (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.121301

Two dimensional disordered superconductors with broken spin-rotation and time-reversal invariance, e.g. with p_x+ip_y pairing, can exhibit plateaus in the thermal Hall coefficient (the thermal quantum Hall effect). Our numerical simulations show that the Hall insulating regions of the phase diagram can support a sub-phase where the quasiparticle density of states is divergent at zero energy, \rho(E)\sim |E|^{1/z-1}, with a non-universal exponent $z>1$, due to the effects of rare configurations of disorder (``Griffiths phase'').

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