Journal
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
Volume 111, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ppnp.2019.103739
Keywords
BCS-BEC crossover; Ultracold Fermi gas; Fermi superfluids; Bose Einstein condensation; Neutron star; Strong-coupling phenomenon
Categories
Funding
- MEXT in Japan [16K05503, 18H05406, 18K11345, 19K03689]
- JSPS in Japan [16K05503, 18H05406, 18K11345, 19K03689, 17J03975]
Ask authors/readers for more resources
We review the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover phenomenon discussed in an ultracold Fermi atomic gas and a neutron superfluid in the low-density crust regime of a neutron star. A purpose of this paper is to show that these two very different atomic and nuclear systems can be closely related to each other from the viewpoint of this quantum many-body phenomenon. We explain how the BCS-BEC crossover is realized in the former atomic system by using the novel pairing mechanism called Feshbach resonance. We present a simple explanation for this crossover phenomenon to grasp the essence, as well as detailed microscopic theories that can cover the entire BCS-BEC crossover region. In the latter, we point out that the ordinary BCS theory already has the ability to describe the BCS-BEC crossover at T = 0. At finite temperatures T > 0, however, we need to go beyond this mean-field theory. Besides general aspects of the BCS-BEC crossover phenomenon, we also pick up special topics peculiar to each atomic gas and neutron fluid. The first one is the pseudogap phenomenon in the normal state of a Fermi atomic gas. The second one is the problem of non-zero effective range in an -wave neutron superfluid. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available