Off-site trimer superfluid on a one-dimensional optical lattice

doi:10.1088/1674-1056/26/4/043701

Abstract The Bose-Hubbard model with an effective off-site three-body tunneling, characterized by jumps towards one another, between one atom on a site and a pair atoms on the neighborhood site, is studied systematically on a one-dimensional (1D) lattice, by using the density matrix renormalization group method. The off-site trimer superfluid, condensing at momentum k=0, emerges in the softcore Bose-Hubbard model but it disappears in the hardcore Bose-Hubbard model. Our results numerically verify that the off-site trimer superfluid phase derived in the momentum space from [Phys. Rev. A 81, 011601(R) (2010)] is stable in the thermodynamic limit. The off-site trimer superfluid phase, the partially off-site trimer superfluid phase and the Mott insulator phase are found, as well as interesting phase transitions, such as the continuous or first-order phase transition from the trimer superfluid phase to the Mott insulator phase. Our results are helpful in realizing this novel off-site trimer superfluid phase by cold atom experiments.

Keywords: Bose-Hubbard model off-site trimer superfluid density matrix renormalization group method

Received: 28 September 2016
Revised: 03 January 2017
Accepted manuscript online:

PACS:	37.10.Jk	(Atoms in optical lattices)
	05.30.Jp	(Boson systems)
	03.75.Lm	(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11305113) and the Project GDW201400042 for the "High End Foreign Experts Program".

Corresponding Authors: Wan-Zhou Zhang
E-mail: zhangwanzhou@tyut.edu.cn

Cite this article:

Er-Nv Fan(范二女), Tony C Scott, Wan-Zhou Zhang(张万舟) Off-site trimer superfluid on a one-dimensional optical lattice 2017 Chin. Phys. B 26 043701

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