Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 113019 |
| Fachzeitschrift | New journal of physics |
| Jahrgang | 25 |
| Ausgabenummer | 11 |
| Publikationsstatus | Veröffentlicht - 15 Nov. 2023 |
| Extern publiziert | Ja |
Abstract
Universality of the long-distance behavior across the Bardeen-Cooper-Schrieffer (BEC)-Bose-Einstein condensate (BCS) smooth transition for two-body density correlation functions and the Cooper-pair probability density is demonstrated in a balanced mixture of a two-component Fermi gas at T = 0. It is numerically shown at the mean-field level that these two-body quantities exhibit an exponential decay in terms of the chemical potential and the low-energy behavior of the gap. A general expression is found for the two-body distributions holding for different features of finite-range potentials, such as divergences at the origin, discontinuities at a finite radius, power-law decay, and exponential decay. The correlation length characterizing the long-distance behavior unravels the dependence on the energy needed to break pairs along the BEC-BCS crossover, a quantity meaningful to the stability of the many-body state.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Allgemeine Physik und Astronomie
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in: New journal of physics, Jahrgang 25, Nr. 11, 113019, 15.11.2023.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Universal correlations along the BEC-BCS crossover
AU - Obeso-Jureidini, J. C.
AU - Domínguez-Castro, G. A.
AU - Neri, E.
AU - Paredes, R.
AU - Romero-Rochín, V.
PY - 2023/11/15
Y1 - 2023/11/15
N2 - Universality of the long-distance behavior across the Bardeen-Cooper-Schrieffer (BEC)-Bose-Einstein condensate (BCS) smooth transition for two-body density correlation functions and the Cooper-pair probability density is demonstrated in a balanced mixture of a two-component Fermi gas at T = 0. It is numerically shown at the mean-field level that these two-body quantities exhibit an exponential decay in terms of the chemical potential and the low-energy behavior of the gap. A general expression is found for the two-body distributions holding for different features of finite-range potentials, such as divergences at the origin, discontinuities at a finite radius, power-law decay, and exponential decay. The correlation length characterizing the long-distance behavior unravels the dependence on the energy needed to break pairs along the BEC-BCS crossover, a quantity meaningful to the stability of the many-body state.
AB - Universality of the long-distance behavior across the Bardeen-Cooper-Schrieffer (BEC)-Bose-Einstein condensate (BCS) smooth transition for two-body density correlation functions and the Cooper-pair probability density is demonstrated in a balanced mixture of a two-component Fermi gas at T = 0. It is numerically shown at the mean-field level that these two-body quantities exhibit an exponential decay in terms of the chemical potential and the low-energy behavior of the gap. A general expression is found for the two-body distributions holding for different features of finite-range potentials, such as divergences at the origin, discontinuities at a finite radius, power-law decay, and exponential decay. The correlation length characterizing the long-distance behavior unravels the dependence on the energy needed to break pairs along the BEC-BCS crossover, a quantity meaningful to the stability of the many-body state.
KW - BEC-BCS crossover
KW - correlation functions
KW - superfluids
KW - ultracold quantum matter
UR - http://www.scopus.com/inward/record.url?scp=85183983145&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/ad0854
DO - 10.1088/1367-2630/ad0854
M3 - Article
AN - SCOPUS:85183983145
VL - 25
JO - New journal of physics
JF - New journal of physics
SN - 1367-2630
IS - 11
M1 - 113019
ER -