Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series IPHT-STA
Subjects cond-mat
Date Monday 25 November 2019
Time 14:00
Institute IPHT
Seminar Room Salle Claude Itzykson, Bât. 774
Speaker's Last Name Natan Andrei
Speaker's First Name
Speaker's Email Address
Speaker's Institution Rutgers University
Title Quantum Work of Optical Lattices
Abstract A typical quench experiment consists of a sudden release of a cold atomic gas from an optical lattice. The local properties of the quench dynamics have been extensively studied, however the global properties of this non-equilibrium quantum systems have received less attention. Here we study some aspects of global non-equilibrium behavior by calculating the amount of work done by the quench as measured through the work distribution function. Using Bethe Ansatz techniques we determine the Loschmidt echo and from it the work distribution function of a gas of bosons initially held in a deep periodic potential and subsequently either the potential is completely removed (process described by the Lieb-Liniger model) or lowered (process described by the Sine-Gordon model). We find the average work and its universal edge exponents at threshold and determine the long time decay of the Loshcmidt echo. We highlight striking differences caused by the interactions as well as the changes in the geometry of the system. We study repulsive as well as attractive interactions. In particular we examine the prominent role played by bound states in the work distribution and show that, with low probability, they allow for negative work to be extracted from the quench.
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