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arXiv · 1809.07219

Mixed-order symmetry-breaking quantum phase transition far from equilibrium

T. O. Puel·S. Chesi·S. Kirchner·P. Ribeiro
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Abstract

We study the current-carrying steady-state of a transverse field Ising chain coupled to magnetic thermal reservoirs and obtain the non-equilibrium 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 non-vanishing 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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T. O. Puel, S. Chesi, S. Kirchner, P. Ribeiro. 2018-09-19. Mixed-order symmetry-breaking quantum phase transition far from equilibrium. https://doi.org/10.1103/physrevlett.122.235701

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