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періодичних видань НАН України
періодичних видань НАН України
Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
Репозиторій DSpace/Manakin
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Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach
Тема:
Специальный выпуск К 90-летию со дня рождения A.A. Абрикосова
Інший ID:
PACS: 74.20.Fg, 74.25.Вt, 74.78.–w
Посилання:
Evolution of the dynamics of neutral superconductors between BCS and BEC regimes: the variational approach / A.V. Chubukov, D. Mozyrsky // Физика низких температур. — 2018. — Т. 44, № 6. — С. 684-690. — Бібліогр.: 42 назв. — англ.
Підтримка:
We thank I. Aleiner, J.J. Dziarmaga, I. Martin, M. Stone,
J. Sauls, D. Solenov, and G.E. Volovik for valuable discussions. The work at Los Alamos was performed under the
auspices of the United States Department of Energy under
Contract DE5AC52-06NA25396 and supported by LDRD
and BES Grant No’s. 20170460ER and E3B7, respectively.
The work by AVC was supported by the Office of Basic
Energy Sciences U.S. Department of Energy under award
DE-SC0014402. AVC is thankful to KITP at UCSB, where
part of the work has been done. KITP is supported by NSF
grant PHY-1125915.
Дата:
2018
Переглядів:
305
Завантажень:
223
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.
