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Quantum Simulation

The critical velocity in the BEC-BCS crossover

arXiv
Authors: Wolf Weimer, Kai Morgener, Vijay Pal Singh, Jonas Siegl, Klaus Hueck, Niclas Luick, Ludwig Mathey, Henning Moritz

Year

2014

Paper ID

47948

Status

Preprint

Abstract Read

~2 min

Abstract Words

116

Citations

N/A

Abstract

We map out the critical velocity in the crossover from Bose-Einstein condensation (BEC) to Bardeen-Cooper-Schrieffer superfluidity with ultracold 6Li gases. A small attractive potential is dragged along lines of constant column density. The rate of the induced heating increases steeply above a critical velocity vc. In the same samples, we measure the speed of sound vs by exciting density waves and compare the results to the measured values of vc. We perform numerical simulations in the BEC regime and find very good agreement, validating the approach. In the strongly correlated regime, where theoretical predictions only exist for the speed of sound, our measurements of vc provide a testing ground for theoretical approaches.

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  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
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  • We map out the critical velocity in the crossover from Bose-Einstein condensation (BEC) to Bardeen-Cooper-Schrieffer superfluidity with ultracold ^6Li gases.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1408.5239 [2] arXiv https://arxiv.org/abs/1408.5239 [3] Publisher https://arxiv.org/abs/1408.5239

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