Superfluidity and binary-correlations within clusters of fermions

Details Superfluidity and binary-correlations within clusters of fermions Superfluidity and binary-correlations within clusters of fermions

2005-11-17

arxiv.org/abs/cond-mat/0511444v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1088/0953-4075/39/8/014

We propose a method for simulating the behaviour of small clusters of particles that explicitly accounts for all mean-field and binary-correlation effects. Our approach leads to a set of variational equations that can be used to study both the dynamics and thermodynamics of these clusters. As an illustration of this method, we explore the BCS-BEC crossover in the simple model of four fermions, interacting with finite-range potentials, in a harmonic potential. We find, in the crossover regime, that the particles prefer to occupy two distinct pair states as opposed to the one assumed by BCS theory.

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