We investigate the zero-temperature BCS to Bose-Einstein crossover at the mean-field level, by driving it with the attractive potential and the particle density. We emphasize specifically the role played by the particle density in this crossover. Three different interparticle potentials are considered for the continuum model in three spatial dimensions, while both s- and d-wave solutions are analyzed for the attractive ~extended! Hubbard model on a two-dimensional square lattice. For this model the peculiar behavior of the crossover for the d-wave solution is discussed. In particular, in the strong-coupling limit when approaching half-filling we evidence the occurrence of strong correlations among antiparallel-spin fermions belonging to different composite bosons, which give rise to a quasi-long-range antiferromagnetic order in this limit.

ANDRENACCI N., PERALI, A., PIERI, P., STRINATI CALVANESE, G. (1999). Density-induced BCS to Bose-Einstein crossover. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 60(17), 12410-12418 [10.1103/PhysRevB.60.12410].

Density-induced BCS to Bose-Einstein crossover

PIERI, Pierbiagio;
1999

Abstract

We investigate the zero-temperature BCS to Bose-Einstein crossover at the mean-field level, by driving it with the attractive potential and the particle density. We emphasize specifically the role played by the particle density in this crossover. Three different interparticle potentials are considered for the continuum model in three spatial dimensions, while both s- and d-wave solutions are analyzed for the attractive ~extended! Hubbard model on a two-dimensional square lattice. For this model the peculiar behavior of the crossover for the d-wave solution is discussed. In particular, in the strong-coupling limit when approaching half-filling we evidence the occurrence of strong correlations among antiparallel-spin fermions belonging to different composite bosons, which give rise to a quasi-long-range antiferromagnetic order in this limit.
1999
ANDRENACCI N., PERALI, A., PIERI, P., STRINATI CALVANESE, G. (1999). Density-induced BCS to Bose-Einstein crossover. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 60(17), 12410-12418 [10.1103/PhysRevB.60.12410].
ANDRENACCI N.; PERALI, Andrea; PIERI, Pierbiagio; STRINATI CALVANESE, Giancarlo
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/771238
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 79
  • ???jsp.display-item.citation.isi??? 74
social impact