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Title: Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: The variational approach

Here, we use variational approach to analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2D case, when BCS-BEC crossover occurs already at weak coupling and is governed by the ratio of the two scales—the Fermi energy E F and the bound state energy for two fermions in a vacuum, E 0. BCS and BEC regimes correspond to E F >>E 0 and E F << E 0, respectively. We compute the spectrum of low-energy bosonic excitations and show that the velocity of phase fluctuations remains v F/√2 through BCS-BEC crossover. We also discuss the topological AΦ term in the effective action.
Authors:
 [1] ; ORCiD logo [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-23263
Journal ID: ISSN 1063-777X
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396; SC0014402; PHY-1125915
Type:
Accepted Manuscript
Journal Name:
Low Temperature Physics
Additional Journal Information:
Journal Volume: 44; Journal Issue: 6; Journal ID: ISSN 1063-777X
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BCS-BEC transition
OSTI Identifier:
1483525

Chubukov, Andrey V., and Mozyrsky, Dmitry. Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: The variational approach. United States: N. p., Web. doi:10.1063/1.5037555.
Chubukov, Andrey V., & Mozyrsky, Dmitry. Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: The variational approach. United States. doi:10.1063/1.5037555.
Chubukov, Andrey V., and Mozyrsky, Dmitry. 2018. "Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: The variational approach". United States. doi:10.1063/1.5037555.
@article{osti_1483525,
title = {Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: The variational approach},
author = {Chubukov, Andrey V. and Mozyrsky, Dmitry},
abstractNote = {Here, we use variational approach to analyze the evolution of the dynamics of a neutral s-wave superconductor between BCS and BEC regimes. We consider 2D case, when BCS-BEC crossover occurs already at weak coupling and is governed by the ratio of the two scales—the Fermi energy EF and the bound state energy for two fermions in a vacuum, E0. BCS and BEC regimes correspond to EF >>E0 and EF << E0, respectively. We compute the spectrum of low-energy bosonic excitations and show that the velocity of phase fluctuations remains vF/√2 through BCS-BEC crossover. We also discuss the topological AΦ term in the effective action.},
doi = {10.1063/1.5037555},
journal = {Low Temperature Physics},
number = 6,
volume = 44,
place = {United States},
year = {2018},
month = {4}
}