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

Автор(и)

  • Andrey V. Chubukov Department of Physics, University of Minnesota, Minneapolis MN 55455, USA
  • Dmitry Mozyrsky Theoretical Division (T-4), Los Alamos National Laboratory, Los Alamos NM 87545, USA

DOI:

https://doi.org/10.1063/1.5037555

Ключові слова:

s-wave, superconductor, Berry phase.

Анотація

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 υF / 2 through BCS–BEC crossover. We also discuss the topological Aφ ̇ term in the effective action.

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Опубліковано

2018-04-17

Як цитувати

(1)
Chubukov, A. V.; Mozyrsky, D. Evolution of the Dynamics of Neutral Superconductors Between BCS and BEC Regimes: The Variational Approach. Fiz. Nizk. Temp. 2018, 44, 684-690.

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