Physics – Condensed Matter – Quantum Gases
Scientific paper
2012-04-05
Physics
Condensed Matter
Quantum Gases
5 pages, 5 figures, to appear in Journal of the Physical Society of Japan
Scientific paper
We study the ground state properties of spin-1 bosons in a two-dimensional optical lattice, by applying a variational Monte Carlo method to the S=1 Bose-Hubbard model on a square lattice at unit filling. A doublon-holon binding factor introduced in the trial state provides a noticeable improvement in the variational energy over the conventional Gutzwiller wave function and allows us to deal effectively with the inter-site correlations of particle densities and spins. We systematically show how spin-dependent interactions modify the superfluid-Mott insulator transitions in the S=1 Bose-Hubbard model due to the interplay between the density and spin fluctuations of bosons. Furthermore, regarding the magnetic phases in the Mott region, the calculated spin structure factor elucidates the emergence of nematic and ferromagnetic spin orders for antiferromagnetic ($U_2>0$) and ferromagnetic ($U_2<0$) couplings, respectively.
Inaba Kensuke
Toga Yuta
Tsuchiura Hiroki
Yamashita Makoto
Yokoyama Hisatoshi
No associations
LandOfFree
Mott Transition and Spin Structures of Spin-1 Bosons in Two-Dimensional Optical Lattice at Unit Filling does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mott Transition and Spin Structures of Spin-1 Bosons in Two-Dimensional Optical Lattice at Unit Filling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mott Transition and Spin Structures of Spin-1 Bosons in Two-Dimensional Optical Lattice at Unit Filling will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-212642