有效力程在密度诱导BEC-BCS渡越中的作用
量子气体
2023-05-01 v2 超导电性
核理论
摘要
我们阐明了三维两分量费米子玻色-爱因斯坦凝聚(BEC)到Bardeen-Cooper-Schrieffer (BCS)渡越区中有效力程的作用。与靠近宽Feshbach共振、相互作用可用接触型相互作用刻画的超冷费米气体不同,在凝聚态与核系统背景下讨论的密度诱导BEC-BCS渡越中,相互作用力程一般变得重要。用散射长度和有效力程等低能常数刻画非局域相互作用,我们展示了非零有效力程如何影响渡越现象。特别地,我们表明超流序参量在高密度区被强烈抑制,且声速表现出反映系统力学稳定性的非单调行为。此外,我们指出当动量大小远小于时,与接触参数相关的高动量尾可以显现。
引用
@article{arxiv.2206.12599,
title = {Role of the effective range in the density-induced BEC-BCS crossover},
author = {Hiroyuki Tajima and Haozhao Liang},
journal= {arXiv preprint arXiv:2206.12599},
year = {2023}
}
备注
31 pages, 11 figures, In this version, several mistakes and typos have been corrected. The Appendix C for the dilute BEC limit and the molecule-molecule repulsion has been added. The discussion about the nuclear contact has been updated