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Novel Quantum Phases of Two-Component Bosons with Pair Hopping in Synthetic Dimension
Zhi Lin1,2, Chenrong Liu1, Yan Chen1
1Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.
Abstract:
We study two-component (or pseudospin-1/2) bosons with pair hopping interactions in synthetic dimension, for which a feasible experimental scheme on a square optical lattice is also presented. Previous studies have shown that two-component bosons with on-site interspecies interaction can only generate nontrivial interspecies paired superfluid (super-counter-fluidity or pair-superfluid) states. In contrast, apart from interspecies paired superfluid, we reveal two new phases by considering this additional pair hopping interaction. These novel phases are intraspecies paired superfluid (molecular superfluid) and an exotic noninteger Mott insulator which shows a noninteger atom number at each site for each species, but an integer for total atom number.
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