Finite-range effect in the two-dimensional density-induced BCS-BEC crossover

被引：0
|
作者：
Sakakibara, Hikaru [1 ,2 ]
Tajima, Hiroyuki [1 ,3 ]
Liang, Haozhao [1 ,2 ]
机构：
[1] Univ Tokyo, Grad Sch Sci, Dept Phys, 7-3-1,Hongo, Bunkyo, Tokyo 1130033, Japan
[2] RIKEN, Interdisciplinary Theoret & Math Sci Program iTHEM, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[3] RIKEN Nishina Ctr, 2-1,1Hirosawa, Wako, Saitama 3510198, Japan
来源：
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS | 2023年 / 2023卷 / 08期
关键词：
BOSE-CONDENSATION; PHASE-TRANSITIONS; SUPERCONDUCTIVITY; EVOLUTION;
D O I：
10.1093/ptep/ptad098
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We theoretically investigate the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensation (BEC) crossover in a two-dimensional Fermi gas with the finite-range interaction by using the Hartree-Fock-Bogoliubov theory. Expanding the scattering phase shift in terms of the scattering length and effective range, we discuss the effect of the finite-range interaction on the pairing and thermodynamic properties. By solving the gap equation and the number equation self-consistently, we numerically calculate the effective-range dependence of the pairing gap, chemical potential, and pair size throughout the BCS-BEC crossover. Our results would be useful for further understanding of low-dimensional many-body problems.
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页数：12
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