Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-09-26
Phys. Rev. A 85, 041602 (R) (2012)
Physics
Condensed Matter
Quantum Gases
4 pages, 4 figs, Significantly revised version, to appear in PRA-Rapid
Scientific paper
Motivated by experiments on Josephson junction arrays, and cold atoms in an optical lattice in a synthetic magnetic field, we study the "fully frustrated" Bose-Hubbard (FFBH) model with half a magnetic flux quantum per plaquette. We obtain the phase diagram of this model on a two-leg ladder at integer filling via the density matrix renormalization group approach, complemented by Monte Carlo simulations on an effective classical XY model. The ground state at intermediate correlations is consistently shown to be a chiral Mott insulator (CMI) with a gap to all excitations and staggered loop currents which spontaneously break time reversal symmetry. We characterize the CMI state as a vortex supersolid or an indirect exciton condensate, and discuss various experimental implications.
Dhar Arya
Maji Maheswar
Mishra Tapan
Mukerjee Subroto
Pai Ramesh V.
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