منابع مشابه
Strong-coupling expansions for the attractive Holstein and Hubbard models.
A strong-coupling expansion for the Holstein (electron-phonon) model is carried out through fourth order. In the large frequency limit the expansion agrees with known results for the attractive Hubbard model. Mean-eld theory is employed to determine transition temperatures of the eeective (pseudospin) Hamiltonian and the results are compared with recent Monte Carlo simulations of these models i...
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We study the interaction-induced localization – the so-called self-trapping – of a neutral impurity atom immersed in a homogeneous Bose-Einstein condensate (BEC). Based on a Hartree description of the BEC we show that – unlike repulsive impurities – attractive impurities have a singular ground state in 3d and shrink to a point-like state in 2d as the coupling approaches a critical value β⋆. Mor...
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The formation and dissociation of bosonic molecules in an optical lattice, formed by spin-1/2 fermionic atoms, is considered in the presence of an attractive nearest-neighbor interaction. A mean-field approximation reveals three different phases at zero temperature: an empty, a condensate and a Mott-insulating phase. The density of fermionic atoms and the density of bosonic molecules indicate a...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/252629c0