Off-site trimer superfluid on a one-dimensional optical lattice |
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| Affiliation: | 1.College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2.Near India Pvt Ltd, No. 71/72, Jyoti Nivas College Road, Koramangala, Bangalore 560095, India |
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| 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 fromPhys.Rev.A81,011601(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. |
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| Keywords: | Bose-Hubbard model off-site trimer superfluid density matrix renormalization group method |
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