Casimir effect in the nonequilibrium steady state of a quantum spin chain

D. L. González-Cabrera, Z. Rácz, F. Van Wijland

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2 Citations (Scopus)

Abstract

We present a fully microscopics-based calculation of the Casimir effect in a nonequilibrium system, namely, an energy-flux-driven quantum XX chain. The force between the walls (transverse-field impurities) is calculated in a nonequilibrium steady state which is prepared by letting the system evolve from an initial state with the two halves of the chain prepared at equilibrium at different temperatures. The steady state emerging in the large-time limit is homogeneous but carries an energy flux. The Casimir force in this nonequilibrium state is calculated analytically in the limit when the transverse fields are small. We find that the the Casimir force range is reduced compared to the equilibrium case, and suggest that the reason for this is the reduction of fluctuations in the flux-carrying steady state.

Original languageEnglish
Article number052512
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume81
Issue number5
DOIs
Publication statusPublished - May 20 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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