Non-zero entropy density in the XY chain out of equilibrium

Abstract

The von Neumann entropy density of a block of n spins is proved to be non-zero for large n in the non-equilibrium steady state of the XY chain constructed by coupling a finite cutout of the chain to the two infinite parts to its left and right which act as thermal reservoirs at different temperatures. Moreover, the non-equilibrium density is shown to be strictly greater than the density in thermal equilibrium.

References in corpus (1)

• Entanglement in the XX spin chain with an energy current

Cited by in corpus (4)

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