Journal
PHYSICAL REVIEW A
Volume 85, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.061605
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Funding
- NBRPC (973 program) [2011CBA00300 (2011CBA00302), DMR-1105945]
- AFOSR-YIP award
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1105945] Funding Source: National Science Foundation
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We investigate magnetic properties in the superfluid and Mott-insulating states of two-component bosons with spin-orbit (SO) coupling in two-dimensional square optical lattices. The spin-independent hopping integral t and SO coupled one lambda are fitted from band-structure calculations in the continuum, which exhibit oscillations with increasing SO coupling strength. The magnetic superexchange model is derived in the Mott-insulating state with one particle per site, characterized by the Dzyaloshinsky-Moriya interaction. In the limit of |lambda| << |t|, we find a spin spiral Mott state whose pitch value is the same as that in the incommensurate superfluid state, while in the opposite limit |t| << |lambda|, the ground state exhibits a 2 x 2 in-plane spin pattern.
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