Quantum Monte Carlo studies of superfluid Fermi gases

We report results of quantum Monte Carlo calculations of the ground state of dilute Fermi gases with attractive short-range two-body interactions. The strength of the interaction is varied to study different pairing regimes which are characterized by the product of the s-wave scattering length and t...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2004-10, Vol.70 (4), Article 043602
Main Authors: Chang, S. Y., Pandharipande, V. R., Carlson, J., Schmidt, K. E.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COUPLING
ENERGY GAP
FERMI GAS
FERMIONS
GROUND STATES
MOLECULES
MONTE CARLO METHOD
S WAVES
SCATTERING LENGTHS
SUPERFLUIDITY
TWO-BODY PROBLEM
VECTORS
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Summary:We report results of quantum Monte Carlo calculations of the ground state of dilute Fermi gases with attractive short-range two-body interactions. The strength of the interaction is varied to study different pairing regimes which are characterized by the product of the s-wave scattering length and the Fermi wave vector, ak{sub F}. We report results for the ground-state energy, the pairing gap {delta}, and the quasiparticle spectrum. In the weak-coupling regime, 1/ak{sub F}0, the interaction is strong enough to form bound molecules with energy E{sub mol}. For 1/ak{sub F} > or approx. 0.5, we find that weakly interacting composite bosons are formed in the superfluid gas with {delta} and gas energy per particle approaching E{sub mol}/2. In this region, we seem to have Bose-Einstein condensation (BEC) of molecules. The behavior of the energy and the gap in the BCS-to-BEC transition region, -0.5
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.70.043602