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We study the nonequilibrium steady states of an Ising chain in a transverse field h by investigating the effect of a field, which drives the current of energy. The zero-temperature, h- phase diagram is determined exactly, and it is found that the energy current appears continuously above a threshold >₂ (h). The long-range magnetic order (present for h<h₂, <₂) is destroyed in the current-carrying state where the correlations are characterized by power-law, oscillatory decay. The mechanism which generates the power-law correlations in the current-carrying state is discussed.
Antal et al. (Mon,) studied this question.
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