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
相关论文
共 50 条
  • [41] Nonequilibrium noise as a probe of pair-tunneling transport in the BCS-BEC crossover
    Tajima, Hiroyuki
    Oue, Daigo
    Matsuo, Mamoru
    Kato, Takeo
    PNAS NEXUS, 2023, 2 (03):
  • [42] Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas
    Luo, Xuebing
    Zhou, Kezhao
    Zhang, Zhidong
    CHINESE PHYSICS B, 2016, 25 (11)
  • [43] Pseudogap in Fermionic Density of States in the BCS-BEC Crossover of Atomic Fermi Gases
    Tsuchiya, S.
    Watanabe, R.
    Ohashi, Y.
    JOURNAL OF LOW TEMPERATURE PHYSICS, 2010, 158 (1-2) : 29 - 35
  • [44] The contact in the BCS-BEC crossover for finite range interacting ultracold Fermi gases
    Caballero-Benitez, Santiago F.
    Paredes, Rosario
    Romero-Rochin, Victor
    PHYSICS LETTERS A, 2013, 377 (28-30) : 1756 - 1759
  • [45] Excitations in the BCS-BEC crossover regime of a superfluid Fermi gas with a Feshbach resonance
    Ohashi, Y
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2006, 437-38 (234-238): : 234 - 238
  • [46] Dineutron correlations and BCS-BEC crossover in nuclear matter with the Gogny pairing force
    Sun, Bao Yuan
    Pan, Wei
    NUCLEAR PHYSICS A, 2013, 909 : 8 - 19
  • [47] Electron pairing and evidence of a BCS-BEC crossover in d-wave superconductors
    Das, Subrat Kumar
    Khan, Ayan
    Basu, Saurabh
    PHYSICA B-CONDENSED MATTER, 2013, 410 : 99 - 104
  • [48] Superfluid density in the BCS-BEC crossover regime of a two-component Fermi gas at finite temperatures
    Ohashi, Yoji
    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2007, 20 (7-8) : 609 - 612
  • [49] Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor
    Reyes, D.
    Continentino, M. A.
    Deus, F.
    Thomas, C.
    JOURNAL OF PHYSICS-CONDENSED MATTER, 2018, 30 (17)
  • [50] Superfluid Density in the BCS-BEC Crossover Regime of a Two-Component Fermi Gas at Finite Temperatures
    Yoji Ohashi
    Journal of Superconductivity and Novel Magnetism, 2007, 20 : 609 - 612
12345