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
  • [21] BCS-BEC crossover in one-dimensional integrable model
    Wadati, Miki
    Iida, Toshiaki
    PHYSICS LETTERS A, 2007, 360 (03) : 423 - 428
  • [22] Pairing Fluctuations, the BCS-BEC Crossover and Strong Disorder in Superconductors
    Majumdar, Pinaki
    Tarat, Sabyasachi
    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2013, 26 (05) : 1787 - 1793
  • [23] Comparison of different pairing fluctuation approaches to BCS-BEC crossover
    Levin, Kathryn
    Chen, Qijin
    Chien, Chih-Chun
    He, Yan
    ANNALS OF PHYSICS, 2010, 325 (02) : 233 - 264
  • [24] Effect of weak disorder on the BCS-BEC crossover in a two-dimensional Fermi gas
    Khan, Ayan
    Tanatar, B.
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2017, 31 (09):
  • [25] SUPERCONDUCTING NANOWIRES: NEW TYPE OF BCS-BEC CROSSOVER DRIVEN BY QUANTUM-SIZE EFFECTS
    Shanenko, A. A.
    Croitoru, M. D.
    Vagov, A.
    Peeters, F. M.
    PHYSICAL PROPERTIES OF NANOSYSTEMS, 2011, : 119 - +
  • [26] BCS-BEC CROSSOVER WITHOUT APPEAL TO SCATTERING LENGTH THEORY
    Malik, G. P.
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2014, 28 (08):
  • [27] Disorder Induced BCS-BEC Crossover in an Ultracold Fermi Gas
    Khan, Ayan
    Basu, Saurabh
    Tanatar, B.
    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2013, 26 (05) : 1891 - 1895
  • [28] Quantum Fluctuations and Vortex-Antivortex Unbinding in the 2D Bcs-Bec Crossover
    Salasnich, L.
    Bighin, G.
    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2016, 29 (12) : 3103 - 3106
  • [29] Effective theory for the Goldstone field in the BCS-BEC crossover at T=0
    Manes, Juan L.
    Valle, Manuel A.
    ANNALS OF PHYSICS, 2009, 324 (05) : 1136 - 1157
  • [30] BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance
    Ohashi, Y
    Griffin, A
    PHYSICA B-CONDENSED MATTER, 2003, 329 : 40 - 41
12345