Quantum phases of dipolar bosons in one-dimensional optical lattices

Abstract

We theoretically analyze the phase diagram of a quantum gas of bosons that interact via repulsive dipolar interactions. The bosons are tightly confined by an optical lattice in a quasi one-dimensional geometry. In the single-band approximation, their dynamics is described by an extended Bose-Hubbard model where the relevant contributions of the dipolar interactions consist of density-density repulsion and correlated tunneling terms. We evaluate the phase diagram for unit density using numerical techniques based on the density-matrix renormalization group algorithm. Our results predict that correlated tunneling can significantly modify the parameter range of the topological insulator phase. At vanishing values of the onsite interactions, moreover, correlated tunneling promotes the onset of a phase with a large number of low energy metastable configurations.

arXiv comment11 pages, 14 figures, version accepted in PRB

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• Systematic Analysis of Crystalline Phases in Bosonic Lattice Models with Algebraically Decaying Density-Density Interactions
• Superexchange Liquefaction of Strongly Correlated Lattice Dipolar Bosons
• Ground states of one-dimensional dipolar lattice bosons at unit filling
• The role of interaction-induced tunneling in the dynamics of polar lattice bosons