Volume 89, Number 1, January 2010
|Number of page(s)||6|
|Published online||21 January 2010|
Frustrated quantum antiferromagnetism with ultracold bosons in a triangular lattice
ICFO-Institut de Ciències Fotòniques - Av. Canal Olímpic s/n, E-08860 Castelldefels (Barcelona), Spain, EU
2 Universität Hamburg - Luruper Chaussee 149, D-22761 Hamburg, Germany, EU
3 ICREA-Institucio Catalana de Recerca i Estudis Avançats - Lluis Companys 23, E-08010 Barcelona, Spain, EU
Corresponding author: firstname.lastname@example.org
Accepted: 13 December 2009
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).
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 75.10.Jm – Quantized spin models / 75.50.Ee – Antiferromagnetics
© EPLA, 2010
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