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Elementary Excitations of Antiferromagnetic Spin-1 Bosons in an Optical Lattice.
- Source :
- Journal of Low Temperature Physics; Apr2014, Vol. 175 Issue 1/2, p236-242, 7p
- Publication Year :
- 2014
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- QUASIPARTICLES
ANTIFERROMAGNETIC materials
BOSONS
OPTICAL lattices
SUPERFLUIDITY
Subjects
Details
- Language :
- English
- ISSN :
- 00222291
- Volume :
- 175
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Journal of Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 94693909
- Full Text :
- https://doi.org/10.1007/s10909-013-0960-0