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

被引：1
|
作者：
Bertaina, G. [1 ]
机构：
[1] Ecole Polytech Fed Lausanne EPFL, Inst Theoret Phys, CH-1015 Lausanne, Switzerland
来源：
LECTURES ON THE PHYSICS OF STRONGLY CORRELATED SYSTEMS XVI | 2012年 / 1485卷
关键词：
BCS-BEC crossover; Diffusion Monte Carlo; low dimensionality; 2-DIMENSIONAL FERMI GAS;
D O I：
10.1063/1.4755827
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
引用
收藏
页码：286 / 290
页数：5
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