skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Induced interaction in a Fermi gas with a BEC-BCS crossover

Abstract

We study the effect of the induced interaction on the superfluid transition temperature of a Fermi gas with a Bose-Einstein condensation-Bardeen-Cooper-Schrieffer (BEC-BCS) crossover. The Gorkov-Melik-Barkhudarov theory about the induced interaction is extended from the BCS side to the entire crossover and the pairing fluctuation is treated in the approach by Nozieres and Schmitt-Rink. At unitarity, the induced interaction reduces the transition temperature by about 20%. In the BCS limit, the transition temperature is reduced by a factor of about 2.22, as found by Gorkov and Melik-Barkhudarov. Our result shows that the effect of the induced interaction is important both on the BCS side and in the unitary region.

Authors:
; ;  [1]
  1. School of Physics, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
21304751
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 79; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.79.053636; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BCS THEORY; BOSE-EINSTEIN CONDENSATION; FERMI GAS; FERMIONS; FLUCTUATIONS; INTERACTIONS; SUPERFLUIDITY; TRANSITION TEMPERATURE; UNITARITY

Citation Formats

Zengqiang, Yu, Kun, Huang, and Lan, Yin. Induced interaction in a Fermi gas with a BEC-BCS crossover. United States: N. p., 2009. Web. doi:10.1103/PHYSREVA.79.053636.
Zengqiang, Yu, Kun, Huang, & Lan, Yin. Induced interaction in a Fermi gas with a BEC-BCS crossover. United States. https://doi.org/10.1103/PHYSREVA.79.053636
Zengqiang, Yu, Kun, Huang, and Lan, Yin. 2009. "Induced interaction in a Fermi gas with a BEC-BCS crossover". United States. https://doi.org/10.1103/PHYSREVA.79.053636.
@article{osti_21304751,
title = {Induced interaction in a Fermi gas with a BEC-BCS crossover},
author = {Zengqiang, Yu and Kun, Huang and Lan, Yin},
abstractNote = {We study the effect of the induced interaction on the superfluid transition temperature of a Fermi gas with a Bose-Einstein condensation-Bardeen-Cooper-Schrieffer (BEC-BCS) crossover. The Gorkov-Melik-Barkhudarov theory about the induced interaction is extended from the BCS side to the entire crossover and the pairing fluctuation is treated in the approach by Nozieres and Schmitt-Rink. At unitarity, the induced interaction reduces the transition temperature by about 20%. In the BCS limit, the transition temperature is reduced by a factor of about 2.22, as found by Gorkov and Melik-Barkhudarov. Our result shows that the effect of the induced interaction is important both on the BCS side and in the unitary region.},
doi = {10.1103/PHYSREVA.79.053636},
url = {https://www.osti.gov/biblio/21304751}, journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 79,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2009},
month = {Fri May 15 00:00:00 EDT 2009}
}