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Published on: April 19, 2018
Mixed-Order Symmetry-Breaking Quantum Phase Transition Far from Equilibrium
T O Puel1,2,3,4, Stefano Chesi1,5, S Kirchner3,4
1Beijing Computational Science Research Center, Beijing 100193, China.
Abstract:
We study the current-carrying steady state of a transverse field Ising chain coupled to magnetic thermal reservoirs and obtain the nonequilibrium phase diagram as a function of the magnetization potential of the reservoirs. Upon increasing the magnetization bias we observe a discontinuous jump of the magnetic order parameter that coincides with a divergence of the correlation length. For steady states with a nonvanishing conductance, the entanglement entropy at zero temperature displays a bias dependent logarithmic correction that violates the area law and differs from the well-known equilibrium case. Our findings show that out-of-equilibrium conditions allow for novel critical phenomena not possible at equilibrium.
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