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

 

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Opened Access Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential
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Author: Arias Carrasco, José Miguel
Relaño, Armando
Dukelsky, Jorge
Pérez-Fernández, Pedro
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada III
Date: 2014
Published in: Physical Review E, 90 (4), 042139-1-042139-11.
Document type: Article
Abstract: 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.
Cite: Arias Carrasco, J.M., Relaño, A., Dukelsky Bercovich, J. y Pérez-Fernández, P. (2014). Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential. Physical Review E, 90 (4), 042139-1-042139-11.
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URI: http://hdl.handle.net/11441/64771

DOI: https://doi.org/10.1103/PhysRevE.90.042139

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