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Speculations on Bose-Einstein Condensation and Quantum Crystals
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In this paper, it was shown that there exist many-body states of a system of interacting bosons which exhibit both crystalline order and Bose-Einstein condensation into the zero-momentum eigenstate of the single-particle density matrix.Abstract:
It is shown, by almost rigorous arguments, that there exist many-body states of a system of interacting bosons which exhibit both crystalline order and Bose-Einstein condensation into the zero-momentum eigenstate of the single-particle density matrix. The implications of this result are discussed in relation to theories of superfluidity and the nature of quantum crystals.read more
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Many-Body Physics with Ultracold Gases
TL;DR: In this article, a review of recent experimental and theoretical progress concerning many-body phenomena in dilute, ultracold gases is presented, focusing on effects beyond standard weakcoupling descriptions, such as the Mott-Hubbard transition in optical lattices, strongly interacting gases in one and two dimensions, or lowest-Landau-level physics in quasi-two-dimensional gases in fast rotation.
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The physics of dipolar bosonic quantum gases
Thierry Lahaye,Thierry Lahaye,Thierry Lahaye,C. Menotti,Luis Santos,Maciej Lewenstein,Tilman Pfau +6 more
TL;DR: In this paper, a review of the recent theoretical and experimental advances in the study of ultra-cold gases made of bosonic particles interacting via the long-range, anisotropic dipole-dipole interaction, in addition to the short-range and isotropic contact interaction usually at work in ultracold gases is presented.
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Dicke quantum phase transition with a superfluid gas in an optical cavity
TL;DR: In this paper, the Dicke phase transition in an open system formed by a Bose-Einstein condensate coupled to an optical cavity has been realized, and the phase transition is driven by infinitely long-range interactions between the condensed atoms, induced by two-photon processes involving the cavity mode and a pump field.
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Spinor Bose–Einstein condensates
Yuki Kawaguchi,Masahito Ueda +1 more
TL;DR: An overview of spinor and dipolar Bose-Einstein condensates is given in this paper, where the symmetry of the order parameter is classified using group theory, and various topological excitations are investigated based on homotopy theory.
Journal ArticleDOI
Probable observation of a supersolid helium phase
Eunseong Kim,M. H. W. Chan +1 more
TL;DR: Torsional oscillator measurements on solid helium confined in a porous medium find an abrupt drop in the rotational inertia of the confined solid below a certain critical temperature and show that all three states of matter—gas, liquid and solid—can undergo Bose–Einstein condensation.