Quantum Monte Carlo Studies of Superfluid Fermi Gases

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dc.creatorChang, S. Y.
dc.creatorCarlson, J.
dc.creatorPandharipande, V. R.
dc.creatorSchmidt, K. E.
dc.date2004-04-24
dc.date2004-06-16
dc.date.accessioned2026-07-07T12:37:45Z
dc.date.available2026-07-07T12:37:45Z
dc.descriptionWe 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, $ak_F$. We report results for the ground state energy, the pairing gap $Δ$ and the quasiparticle spectrum. In the weak coupling regime, $1/ak_F < -1$, we obtain BCS superfluid and the energy gap $Δ$ is much smaller than the Fermi gas energy $E_{FG}$. When $ a > 0$, the interaction is strong enough to form bound molecules with energy $E_{mol}$. For $1/ak_F \gtrsim 0.5$ we find that weakly interacting composite bosons are formed in the superfluid gas with $Δ$ and gas energy per particle approaching $|E_{mol}|/2$. 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, $-0.5 < 1/ak_F < 0.5$ is discussed.
dc.description11 figures, 3 tables
dc.identifierhttps://arxiv.org/abs/physics/0404115
dc.identifierhttp://arxiv.org/abs/physics/0404115
dc.identifierPhys.Rev.A70:043602,2004
dc.identifierdoi:10.1103/PhysRevA.70.043602
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218549
dc.subjectAtomic Physics
dc.titleQuantum Monte Carlo Studies of Superfluid Fermi Gases
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