Phase diagram of the Bose-Hubbard model on a ring-shaped lattice with tunable weak links
Hettiarachchilage, Kalani · Rousseau, Valéry G. · Tam, Ka-Ming · Jarrell, Mark · Moreno, Juana
Original · EN
Motivated by recent experiments on toroidal Bose-Einstein condensates in all-optical traps with tunable weak links, we study the one-dimensional Bose-Hubbard model on a ring-shaped lattice with a small region of weak hopping integrals using quantum Monte Carlo simulations. Besides the usual Mott insulating and superfluid phases, we find a phase which is compressible but non superfluid with a local Mott region. This `local Mott' phase extends in a large region of the phase diagram. These results suggest that the insulating and conducting phases can be tuned by a local parameter which may provide a new insight to the design of atomtronic devices.
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