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

Authors
Lancaster, Jarrett
Mitra, Aditi
Published in Physical Review. B, Condensed Matter. 2011, vol. 84, no. 7
Abstract The effect of interactions on a system of fermions that are in a nonequilibrium steady state due to a quantum quench is studied employing the random phase approximation. As a result of the quench, the distribution function of the fermions is greatly broadened. This gives rise to an enhanced particle-hole spectrum and overdamped 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 to the nature of the nonequilibrium steady state is explored by also considering a quench that produces a current-carrying steady state.
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LANCASTER, Jarrett, GIAMARCHI, Thierry, MITRA, Aditi. Random phase approximation study of one-dimensional fermions after a quantum quench. In: Physical Review. B, Condensed Matter, 2011, vol. 84, n° 7. https://archive-ouverte.unige.ch/unige:35939

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Deposited on : 2014-04-22

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