Relativistic BCS-BEC Crossover at Zero Temperature

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dc.creatorHe, Lianyi
dc.creatorZhuang, Pengfei
dc.date2007-03-05
dc.date2007-04-18
dc.date.accessioned2026-07-07T11:22:43Z
dc.date.available2026-07-07T11:22:43Z
dc.descriptionWe investigate the BCS-BEC crossover at zero temperature in the frame of a relativistic model. The universality of the BCS-BEC crossover for non-relativistic systems breaks down in relativistic case and the crossover can be induced by changing the density. When the effective scattering length is much less than the fermion Compton wavelength, we recover the non-relativistic result if the gas is initially in non-relativistic state. At ultra-strong coupling where the scattering length is of the order of the Compton wavelength, a new BEC state appears. In this state the condensed bosons become nearly massless and anti-fermions are excited. The behavior of the Goldstone mode and the mixing between the amplitude and phase modes are significantly different in different condensed regions.
dc.description8 pages, 3 figures. V2: typos corrected, a comment on mean field theory added
dc.identifierhttps://arxiv.org/abs/hep-ph/0703042
dc.identifierhttp://arxiv.org/abs/hep-ph/0703042
dc.identifierPhys.Rev.D75:096003,2007
dc.identifierdoi:10.1103/PhysRevD.75.096003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194667
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectSuperconductivity
dc.subjectHigh Energy Physics - Theory
dc.subjectNuclear Theory
dc.titleRelativistic BCS-BEC Crossover at Zero Temperature
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