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research article
BCS-BEC Crossover in a Two-Dimensional Fermi Gas
We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) superfluidity to Bose-Einstein condensation (BEC) in a two-dimensional Fermi gas at T = 0 using the fixed-node diffusion Monte Carlo method. We calculate the equation of state and the gap parameter as a function of the interaction strength, observing large deviations compared to mean-field predictions. In the BEC regime our results show the important role of dimer-dimer and atom-dimer interaction effects that are completely neglected in the mean-field picture. Results on Tan's contact parameter associated with short-range physics are also reported along the BCS-BEC crossover.
Type
research article
Web of Science ID
WOS:000288450800003
Authors
Publication date
2011
Published in
Volume
106
Issue
11
Article Number
110403
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
March 16, 2011
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