Journal
NEW JOURNAL OF PHYSICS
Volume 12, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/12/2/025014
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Funding
- Austrian Science Foundation (FWF) [SFB F40 FOQUS]
- EuroQUAM_DQS [I118_N16]
- DARPA OLE
- STREP [FP7-ICT-2007-C]
- Austrian Ministry of Science BMWF
- Centre for Quantum Physics at LFU Innsbruck
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We analyse the time dependence of currents in a one-dimensional (1D) Bose gas in an optical lattice. For a 1D system, the stability of currents induced by accelerating the lattice exhibits a broad crossover as a function of the magnitude of the acceleration, and the strength of the inter-particle interactions. This differs markedly from mean-field results in higher dimensions. Using the infinite time evolving block decimation algorithm, we characterize this crossover by making quantitative predictions for the time-dependent behaviour of the currents and their decay rate. We also compute the time dependence of quasi-condensate fractions which can be measured directly in experiments. We compare our results to calculations based on phase-slip methods, finding agreement with the scaling as the particle density increases, but with significant deviations near unit filling.
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