BCS-BEC crossover in a two-dimensional Fermi gas

Details BCS-BEC crossover in a two-dimensional Fermi gas BCS-BEC crossover in a two-dimensional Fermi gas

2010-11-16

arxiv.org/abs/1011.3737v2

Phys. Rev. Lett. 106, 110403 (2011)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.110403

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.

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