Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential
| Autor: | P. Pérez-Fernández, Jorge Dukelsky, Armando Relaño, José María Arias |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. Departamento de Física Aplicada III |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Quantum phase transition Condensed Matter::Quantum Gases Quantum Physics Bose gas Degenerate energy levels Termodinámica FOS: Physical sciences Double-well potential Quantum Gases (cond-mat.quant-gas) Excited state Coherent states Atomic physics Ground state Quantum Physics (quant-ph) Condensed Matter - Quantum Gases Boson |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid Digital.CSIC. Repositorio Institucional del CSIC idUS. Depósito de Investigación de la Universidad de Sevilla |
| ISSN: | 2012-3531 |
| Popis: | 11 pags. ; 10 figs. ; PACS number(s): 05.30.Rt, 05.70.Fh, 64.70.Tg, 03.75.Lm 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. ©2014 American Physical Society This work is has been partially supported by the Spanish MINECO Grants No. FIS2012-35316, No. FIS2012-34479, and No. FIS2011-28738-c02-01, by Junta de Andaluc´ıa under group number FQM-160 and Project P11-FQM-7632, and by the Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042). |
| Databáze: | OpenAIRE |
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