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Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential

AuthorsRelaño, Armando; Dukelsky, Jorge CSIC ORCID; Pérez-Fernández, P.; Arias, José María
Issue Date27-Oct-2014
PublisherAmerican Physical Society
CitationPhysical Review - Section E - Statistical Nonlinear and Soft Matter Physics, 90, 042139 (2014)
AbstractThe ground state and spectral properties of Bose gases in double-well potentials are studied in two different scenarios: (i) an interacting atomic Bose gas, and (ii) a mixture of an atomic gas interacting with diatomic molecules. A ground state second-order quantum phase transition is observed in both scenarios. For large attractive values of the atom-atom interaction, the ground state is degenerate. For repulsive and small attractive interaction, the ground state is not degenerate and is well approximated by a boson coherent state. Both systems depict an excited state quantum phase transition. In both cases, a critical energy separates a region in which all the energy levels are degenerate in pairs, from another region in which there are no degeneracies. For the atomic system, the critical point displays a singularity in the density of states, whereas this behavior is largely smoothed for the mixed atom-molecule system. ©2014 American Physical Society
Description11 pags. ; 10 figs. ; PACS number(s): 05.30.Rt, 05.70.Fh, 64.70.Tg, 03.75.Lm
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevE.90.042139
Appears in Collections:(CFMAC-IEM) Artículos
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