title: Non-equilibrium scale invariance and shortcuts to adiabaticity in a one-dimensional Bose gas.
abstract: 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.
authors: Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
authors: W
authors: W
authors: Rohringer
authors: Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
authors: D
authors: D
authors: Fischer
authors: Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
authors: F
authors: F
authors: Steiner
authors: 1] Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria [2] Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021 St. Petersburg, Russia [3] Wolfgang Pauli Institute, 1090 Vienna, Austria.
authors: I E
authors: IE
authors: Mazets
authors: Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
authors: J
authors: J
authors: Schmiedmayer
authors: Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
authors: M
authors: M
authors: Trupke