A random phase approximation study of one-dimensional fermions after a quantum quench

Details A random phase approximation study of one-dimensional fermions after a quantum quench A random phase approximation study of one-dimensional fermions after a quantum quench

2011-05-30

arxiv.org/abs/1105.6039v2

Phys. Rev. B 84, 075143 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 3 figures, published version

Scientific paper

The effect of interactions on a system of fermions that are in a non-equilibrium steady state due to a quantum quench is studied employing the random-phase-approximation (RPA). As a result of the quench, the distribution function of the fermions is highly broadened. This gives rise to an enhanced particle-hole spectrum and over-damped collective modes for attractive interactions between fermions. On the other hand, for repulsive interactions, an undamped mode above the particle-hole continuum survives. The sensitivity of the result on the nature of the non-equilibrium steady state is explored by also considering a quench that produces a current carrying steady-state.

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