Scientific Results

BCS-BEC Crossover in a Two-Dimensional Fermi Gas

Year: 2011

Authors: Bertaina G., Giorgini S.

Autors Affiliation: Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne EPFL, CH-1015 Lausanne, Switzerland;
INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy

Abstract: 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.


Volume: 106 (11)      Pages from: 110403  to: 110403

More Information: This work, as part of the European Science Foundation EUROCORES Program \”EuroQUAM-FerMix\”, was supported by funds from the CNR and the EC Sixth Framework Programme.
DOI: 10.1103/PhysRevLett.106.110403

Citations: 120
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