Tunneling-Induced Restoration of the Degeneracy and the Time-Reversal Symmetry Breaking in Optical Lattices

We study the ground-state properties of bosons loaded into the \(p\)-band of a one dimensional optical lattice. We show that the phase diagram of the system is substantially affected by the anharmonicity of the lattice potential. In particular, for a certain range of tunneling strength, the full man...

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Published inarXiv.org
Main Authors Sowiński, Tomasz, Łacki, Mateusz, Dutta, Omjyoti, Pietraszewicz, Joanna, Sierant, Piotr, Gajda, Mariusz, Zakrzewski, Jakub, Lewenstein, Maciej
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 19.11.2013
Subjects
Angular momentum
Anharmonicity
Bosons
Broken symmetry
Ground state
Optical lattices
Optical properties
Phase diagrams
Physics - Quantum Gases
Physics - Quantum Physics
Restoration
Symmetry
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Summary:We study the ground-state properties of bosons loaded into the \(p\)-band of a one dimensional optical lattice. We show that the phase diagram of the system is substantially affected by the anharmonicity of the lattice potential. In particular, for a certain range of tunneling strength, the full many-body ground state of the system becomes degenerate. In this region, an additional symmetry of the system, namely the parity of the occupation number of the chosen orbital, is spontaneously broken. The state with nonvanishing staggered angular momentum, which breaks the time-reversal symmetry, becomes the true ground state of the system.
ISSN:2331-8422
DOI:10.48550/arxiv.1304.6299