BCS-BEC crossover in two dimensions: a Quantum Monte Carlo study

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. We also consider the highly polarized gas and the competition between a polaronic and a molecular picture.


Editor(s):
Avella, A
Mancini, F
Published in:
Lectures On The Physics Of Strongly Correlated Systems Xvi, 1485, 286-290
Presented at:
16th Training Course in the Physics of Strongly Correlated Systems, Vietri sul Mare, ITALY, OCT 03-14, 2011
Year:
2012
Publisher:
Melville, Amer Inst Physics
ISSN:
0094-243X
ISBN:
978-0-7354-1097-8
Keywords:
Laboratories:




 Record created 2013-02-27, last modified 2018-09-13


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