Published September 27, 2017 | Version v1
Publication

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

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Description

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.

Abstract

MINECO FIS2012-35316

Abstract

MINECO FIS2012-34479

Abstract

MINECO FIS2011-28738-c02-01

Abstract

Junta de Andalucía FQM-160

Abstract

Junta de Andalucía P11-FQM-7632

Abstract

Consolider-Ingenio CPAN CSD2007- 00042

Additional details

Created:
March 27, 2023
Modified:
December 1, 2023