Exotic Haldane Superfluid Phase of Soft-Core Bosons in Optical Lattices
arXiv:1505.06958 · doi:10.1103/PhysRevB.93.174507
Abstract
We propose to realize an exotic Haldane superfluid (HSF) phase in an extended Bose-Hubbard model on the two-leg ladder (i.e., a two-species mixture of interacting bosons). The proposal is confirmed by means of large-scale quantum Monte Carlo simulations, with a significant part of the ground-state phase diagram being revealed. Most remarkably, the newly discovered HSF phase features both superfluidity and the non-local topological Haldane order. The effects induced by varying the number of legs are furthermore explored. Our results shed light on how topological superfluid emerges in bosonic systems.
5 pages, 6 figures; accepted for publication in Physical Review B (April 29, 2016)
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