Rohringer W, Fischer D, Steiner F, Mazets I E, Schmiedmayer J, Trupke M
Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.
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.
Sci Rep. 2015 Apr 13;5:9820. doi: 10.1038/srep09820.
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.
我们给出了实验证据，证明在外部捕获势快速变化后，相位波动的准一维玻色气体中激发谱具有尺度不变行为。通过探测自由膨胀中的密度关联，我们发现初始热态的温度与云团的空间扩展成正比，这与基于具有守恒准粒子占据数的初始本征模绝热重标度的模型预测一致。基于这一结果，我们证明了气体快速膨胀或压缩的绝热捷径不会引起额外的加热。
