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Non-equilibrium scale invariance and shortcuts to adiabaticity in a one-dimensional Bose gas

We present experimental evidence for scale invariant behaviour of the excitation spectrum in phase-fluctuating quasi-1d Bose gases after a rapid change of the external trapping potential. Probing density correlations in free expansion, we find that the temperature of an initial thermal state scales with the spatial extension of the cloud as predicted by a model based on adiabatic rescaling of initial eigenmodes with conserved quasiparticle occupation numbers. Based on this result, we demonstrate that shortcuts to adiabaticity for the rapid expansion or compression of the gas do not induce additional heating.

preprint2015arXivOpen access
Wolfgang RohringerDominik FischerFlorian SteinerIgor E MazetsJörg SchmiedmayerMichael Trupke
cond-mat.quant-gas
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Open access6 authors1 topic
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Wolfgang RohringerDominik FischerFlorian SteinerIgor E MazetsJörg SchmiedmayerMichael Trupke

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