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Braid Group and Topological Phase Transitions in Nonequilibrium Stochastic Dynamics

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arxiv 1212.4241 v2 pith:NHBOJLCA submitted 2012-12-18 cond-mat.mes-hall cond-mat.dis-nncond-mat.stat-mech

Braid Group and Topological Phase Transitions in Nonequilibrium Stochastic Dynamics

classification cond-mat.mes-hall cond-mat.dis-nncond-mat.stat-mech
keywords braidcurrentsgroupnon-hermitiannonequilibriumphasesstatestatistics
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show that distinct topological phases of the band structure of a non-Hermitian Hamiltonian can be classified with elements of the braid group. As the proof of principle, we consider the non-Hermitian evolution of the statistics of nonequilibrium stochastic currents. We show that topologically nontrivial phases have detectable properties, including the emergence of decaying oscillations of parity and state probabilities, and discontinuities in the steady state statistics of currents.

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