Elementary excitations of antiferromagnetic spin-1 bosons in an optical lattice
Abstract
We study elementary excitations of spin-1 bosons with antiferromagnetic interaction in an optical lattice by applying the Gutzwiller approximation to the spin-1 Bose-Hubbard model. There appear various excitations associated with spin degrees of freedom in the Mott-insulator (MI) phase as well as in the superfluid (SF) phase. In this system, the ground state in the MI phase is known to exhibit a remarkable effect of even-odd parity of particle filling, in which even fillings stabilize the MI state due to formation of spin-singlet pairs. We find that excitation spectra in the MI phase exhibit characteristic features that reflect the even-odd parity effect of the ground state. We clarify evolution of elementary excitations across the quantum critical point of the SF-MI transition.
Keywords
Cite
@article{arxiv.1310.4930,
title = {Elementary excitations of antiferromagnetic spin-1 bosons in an optical lattice},
author = {Misako Shinozaki and Shunji Tsuchiya and Shumpei Abe and Takeshi Ozaki and Tetsuro Nikuni},
journal= {arXiv preprint arXiv:1310.4930},
year = {2015}
}
Comments
7 pages, 2 figures, proceedings of QFS2013