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Título:
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Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential
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Autores:
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Relaño Pérez, Armando ;
Dukelsky, J. ;
Pérez Fernández, P. ;
Arias, J. M.
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2014-10-27
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Termodinámica
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Tipo = Artículo
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Resumen:
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The 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.
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En línea:
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https://eprints.ucm.es/id/eprint/29017/1/1777.pdf
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