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

• 来源期刊: 中国物理B（英文版）
• 关键词: Bose-Hubbard model off-site trimer superfluid density matrix renormalization group method
• 年，卷（期）: 2017,（4）
• 页码范围: 168-173
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/4/043701

摘要

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.