Spin 1/2 fermions in the unitary regime: A superfluid of a new type

被引：231

作者：

Bulgac, A ^{[1
]}

Drut, JE

Magierski, P

机构：

[1] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[2] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.96.090404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study, in a fully nonperturbative calculation, a dilute system of spin 1/2 interacting fermions, characterized by an infinite scattering length at finite temperatures. Various thermodynamic properties and the condensate fraction are calculated and we also determine the critical temperature for the superfluid-normal phase transition in this regime. The thermodynamic behavior appears as a rather surprising and unexpected melange of fermionic and bosonic features. The thermal response of a spin 1/2 fermion at the BCS-BEC crossover should be classified as that of a new type of superfluid.

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相关论文

共 51 条

[1] Quantum Monte Carlo methods for nuclei at finite temperature [J].

Alhassid, Y .

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2001, 15 (10-11) :1447-1462

[2]

[Anonymous], 1980, Le Journal de Physique Colloques, DOI DOI 10.1051/JPHYSCOL:1980704

[3] Momentum distribution and condensate fraction of a fermion gas in the BCS-BEC crossover [J].

Astrakharchik, GE ;

Boronat, J ;

Casulleras, J ;

Giorgini, S .

PHYSICAL REVIEW LETTERS, 2005, 95 (23)

[4] Equation of state of a Fermi gas in the BEC-BCS crossover: A quantum Monte Carlo study [J].

Astrakharchik, GE ;

Boronat, J ;

Casulleras, J ;

Giorgini, S .

PHYSICAL REVIEW LETTERS, 2004, 93 (20) :200404-1

[5] The MBX Challenge Competition: A neutron matter model [J].

Baker, GA .

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2001, 15 (10-11) :1314-1320

[6] Collective excitations of a degenerate gas at the BEC-BCS crossover [J].

Bartenstein, M ;

Altmeyer, A ;

Riedl, S ;

Jochim, S ;

Chin, C ;

Denschlag, JH ;

Grimm, R .

PHYSICAL REVIEW LETTERS, 2004, 92 (20) :203201-1

[7] Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas [J].

Bartenstein, M ;

Altmeyer, A ;

Riedl, S ;

Jochim, S ;

Chin, C ;

Denschlag, JH ;

Grimm, R .

PHYSICAL REVIEW LETTERS, 2004, 92 (12) :120401-1

[8]

Bishop RF, 2001, INT J MOD PHYS B, V15, pIII

[9] Measurement of the interaction energy near a feshbach resonance in a 6Li Fermi gas -: art. no. 020402 [J].

Bourdel, T ;

Cubizolles, J ;

Khaykovich, L ;

Magalhaes, KMF ;

Kokkelmans, SJJMF ;

Shlyapnikov, GV ;

Salomon, C .

PHYSICAL REVIEW LETTERS, 2003, 91 (02)

[10] Specific heat of a fermionic atomic cloud in the unitary regime [J].

Bulgac, A .

PHYSICAL REVIEW LETTERS, 2005, 95 (14)

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