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EPL Association, European Physical Society Letters, 3(107), p. 30002

DOI: 10.1209/0295-5075/107/30002

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Quantum quenches, linear response and superfluidity out of equilibrium

Journal article published in 2013 by Davide Rossini, Rosario Fazio, Vittorio Giovannetti, Alessandro Silva ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

By analysing the sensitivity to a twist in the boundary conditions of the stationary state attained by a many-body system long after a quantum quench, we extend the concepts of the helicity modulus and the stiffness to non-equilibrium situations. Using these generalised quantities, we characterise the out-of-equilibrium dynamics of hard-core bosons quenched to/from superfluid/insulating phases and show that qualitative new features emerge as compared to the equilibrium case. Our predictions can be tested in experiments with cold bosonic atoms confined in toroidal traps and subject to artificial gauge fields. © CopyrightEPLA, 2014.