Abstract

By using the diffusion Monte Carlo method we calculate the one- and two-body density matrix of an interacting Fermi gas at T = 0 in the BCS to Bose-Einstein condensate (BEC) crossover. Results for the momentum distribution of the atoms, as obtained from the Fourier transform of the one-body density matrix, are reported as a function of the interaction strength. Off-diagonal long-range order in the system is investigated through the asymptotic behavior of the two-body density matrix. The condensate fraction of pairs is calculated in the unitary limit and on both sides of the BCS-BEC crossover.

Keywords

PhysicsCrossoverMomentum (technical analysis)FermionBose–Einstein condensateDensity matrixFermi gasCondensed matter physicsDistribution functionMatrix (chemical analysis)Quantum mechanicsQuantumMaterials science

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Publication Info

Year
2005
Type
article
Volume
95
Issue
23
Pages
230405-230405
Citations
115
Access
Closed

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G. E. Astrakharchik, J. Boronat, J. Casulleras et al. (2005). Momentum Distribution and Condensate Fraction of a Fermion Gas in the BCS-BEC Crossover. Physical Review Letters , 95 (23) , 230405-230405. https://doi.org/10.1103/physrevlett.95.230405

Identifiers

DOI
10.1103/physrevlett.95.230405