Issue |
EPL
Volume 89, Number 1, January 2010
|
|
---|---|---|
Article Number | 10010 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/89/10010 | |
Published online | 21 January 2010 |
Frustrated quantum antiferromagnetism with ultracold bosons in a triangular lattice
1
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: andre.eckardt@icfo.es
Received:
24
September
2009
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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