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Rodríguez, K.* ; Argüelles, A.* ; Colomé-Tatché, M. ; Vekua, T.* ; Santos, L.*

Mott-insulator phases of spin-3/2 fermions in the presence of quadratic zeeman coupling.

Phys. Rev. Lett. 105:050402 (2010)
Postprint DOI
Open Access Green
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
ISSN (print) / ISBN 0031-9007
e-ISSN 1079-7114
Quellenangaben Volume: 105, Issue: 5, Pages: , Article Number: 050402 Supplement: ,
Publisher American Physical Society (APS)
Reviewing status Peer reviewed