Scientific article
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Anomalous pairing of bosons: Effect of multibody interactions in an optical lattice

Published inPhysical Review. A, vol. 98, no. 2, 023615
Publication date2018

A first-order type phase transition between Mott lobes has been reported in Phys. Rev. Lett. 109, 135302 (2012) for a two-dimensional Bose-Hubbard model in the presence of an attractive three-body interaction. We revisit the scenario in systems of ultracold bosons both in one- and two-dimensional lattices using the density matrix renormalization group method and the self-consistent cluster mean-field theory approach, respectively. We show that an unconventional pairing of particles occurs due to the competing repulsive two-body and attractive three-body interactions. This leads to a pair superfluid phase sandwiched between the Mott insulator lobes corresponding to densities density one and three in the strongly interacting regime. This is in contrast to the direct first-order jump as predicted before. Interestingly, the Mott to pair superfluid phase transitions are found to be continuous in nature. We also show that the pair superfluid phase is robust with respect to the ratio between the two- and three-body interaction strengths. In the end, we establish a connection between the Bose-Hubbard model presented in Phys. Rev. Lett. 109, 135302 (2012) with a more general Bose-Hubbard model and analyze the fate of the pair superfluid phase in the presence of an external trapping potential.

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SINGH, Manpreet, GRESCHNER, Sebastian, MISHRA, Tapan. Anomalous pairing of bosons: Effect of multibody interactions in an optical lattice. In: Physical Review. A, 2018, vol. 98, n° 2, p. 023615. doi: 10.1103/PhysRevA.98.023615
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ISSN of the journal1050-2947

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