Experimentally accessible reentrant phase transitions in double-well optical lattices

Danshita, Ippei; de Melo, Carlos A. R. Sa; Clark, Charles W.

Experimentally accessible reentrant phase transitions in double-well optical lattices

Authors

Danshita, Ippei

de Melo, Carlos A. R. Sa

Clark, Charles W.

Description

We study the quantum phases of bosons confined in a combined potential of a one-dimensional double-well optical lattice and a parabolic trap. We apply the time-evolving block decimation method to the corresponding two-legged Bose-Hubbard model. In the absence of a parabolic trap, the system of bosons in the double-well optical lattice exhibits a reentrant quantum phase transition between Mott insulator and superfluid phases at unit filling as the tilt of the double-wells is increased. We show that the reentrant phase transition occurs also in the presence of a parabolic trap and suggest that it can be detected in experiments by measuring the matter-wave interference pattern.
4 pages, 5 figures