Competition between BCS-pairing and ``moth-eaten effect'' in BEC-BCS crossover - Archive ouverte HAL
Article Dans Une Revue Solid State Communications Année : 2012

Competition between BCS-pairing and ``moth-eaten effect'' in BEC-BCS crossover

Résumé

We study the change in condensation energy from a single pair of fermionic atoms to a large number of pairs interacting via the reduced BCS potential. We find that the energy-saving due to correlations decreases when the pair number increases because the number of empty states available for pairing gets smaller (''moth-eaten effect''). However, this decrease dominates the 3D kinetic energy increase of the same amount of noninteracting atoms only when the pair number is a sizable fraction of the number of states available for pairing. As a result, in BEC BCS crossover of 3D systems, the condensation energy per pair first increases and then decreases with pair number while in 2D, it always is controlled by the ``moth-eaten effect'' and thus simply decreases. (C) 2011 Elsevier Ltd. All rights reserved.

Dates et versions

hal-01229178 , version 1 (16-11-2015)

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Citer

Guojun Zhu, Monique Combescot. Competition between BCS-pairing and ``moth-eaten effect'' in BEC-BCS crossover. Solid State Communications, 2012, 152 (2), pp.90-94. ⟨10.1016/j.ssc.2011.10.036⟩. ⟨hal-01229178⟩
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