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Mott-insulator phases of spin-3/2 fermions in the presence of quadratic zeeman coupling.
Phys. Rev. Lett. 105:050402 (2010)
We study the influence of the quadratic Zeeman effect on the Mott-insulator phases of hard-core 1D spin-3/2 fermions. We show that, contrary to spinor bosons, the quadratic Zeeman coupling preserves an SU(2)-SU(2) symmetry, leading for large-enough quadratic Zeeman coupling to an isotropic pseudo-spin-1/2 Heisenberg antiferromagnet. Decreasing the quadratic Zeeman coupling, this phase undergoes, depending on the scattering lengths, either a Kosterlitz-Thouless transition into a gapped dimerized phase or a commensurate-incommensurate transition into a gapless spin liquid. This rich phase diagram can be observed experimentally in four-component fermions in optical lattices under similar entropy constraints to those needed for Néel order in spin-1/2 gases.
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Publication type
Article: Journal article
Document type
Scientific Article
Language
english
Publication Year
2010
HGF-reported in Year
2010
ISSN (print) / ISBN
0031-9007
e-ISSN
1079-7114
Journal
Physical Review Letters
Quellenangaben
Volume: 105,
Issue: 5,
Article Number: 050402
Publisher
American Physical Society (APS)
Reviewing status
Peer reviewed
Institute(s)
Institute of Computational Biology (ICB)
Scopus ID
77955113777
Erfassungsdatum
2020-02-18