Particle-hole fluctuations in the BCS-BEC Crossover

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dc.creatorFloerchinger, S.
dc.creatorScherer, M.
dc.creatorDiehl, S.
dc.creatorWetterich, C.
dc.date2008-08-01
dc.date2008-12-02
dc.date.accessioned2026-07-07T12:32:44Z
dc.date.available2026-07-07T12:32:44Z
dc.descriptionThe effect of particle-hole fluctuations for the BCS-BEC crossover is investigated by use of functional renormalization. We compute the critical temperature for the whole range in the scattering length $a$. On the BCS side for small negative $a$ we recover the Gorkov approximation, while on the BEC side of small positive $a$ the particle-hole fluctuations play no important role, and we find a system of interacting bosons. In the unitarity limit of infinite scattering length our quantitative estimate yields $T_c/T_F=0.264$. We also investigate the crossover from broad to narrow Feshbach resonances -- for the later we obtain $T_c/T_F=0.204$ for $a^{-1}=0$. A key ingredient for our treatment is the computation of the momentum dependent four-fermion vertex and its bosonization in terms of an effective bound-state exchange.
dc.description11 pages, 6 figures. Reference added
dc.identifierhttps://arxiv.org/abs/0808.0150
dc.identifierhttp://arxiv.org/abs/0808.0150
dc.identifierPhys.Rev.B78:174528,2008
dc.identifierdoi:10.1103/PhysRevB.78.174528
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216884
dc.subjectSuperconductivity
dc.titleParticle-hole fluctuations in the BCS-BEC Crossover
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