Frustrated quantum antiferromagnetism with ultracold bosons in a triangular lattice

We propose to realize the anisotropic triangular-lattice Bose-Hubbard model with positive tunneling matrix elements by using ultracold atoms in an optical lattice dressed by a fast lattice oscillation. This model exhibits frustrated antiferromagnetism at experimentally feasible temperatures; it inte...

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Bibliographic Details
Published inEurophysics letters Vol. 89; no. 1; p. 10010
Main Authors Eckardt, A, Hauke, P, Soltan-Panahi, P, Becker, C, Sengstock, K, Lewenstein, M
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.01.2010
EDP Sciences
Subjects
03.75.Lm
75.10.Jm
75.50.Ee
Anisotropy
Antiferromagnetism
Bosons
Lattices
Mathematical models
Optical lattices
Oscillations
Phases
Rotors
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Summary:We propose to realize the anisotropic triangular-lattice Bose-Hubbard model with positive tunneling matrix elements by using ultracold atoms in an optical lattice dressed by a fast lattice oscillation. This model exhibits frustrated antiferromagnetism at experimentally feasible temperatures; it interpolates between a classical rotor model for weak interaction, and a quantum spin-(1/2) XY-model in the limit of hard-core bosons. This allows to explore experimentally gapped spin-liquid phases predicted recently (Schmied R.et al., New J. Phys., 10 (2008) 045017).
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ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/89/10010