Bose-Hubbard model in a strong effective magnetic field: Emergence of a chiral Mott insulator ground state

Dhar, Arya and Maji, Maheswar and Mishra, Tapan and Pai, RV and Mukerjee, Subroto and Paramekanti, Arun (2012) Bose-Hubbard model in a strong effective magnetic field: Emergence of a chiral Mott insulator ground state. In: Physical Review A, 85 (4).

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Abstract

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 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.

Item Type:	Journal Article
Publication:	Physical Review A
Publisher:	The American Physical Society
Additional Information:	Copyright of this article is belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Aug 2012 05:02
Last Modified:	31 Jan 2019 10:35
URI:	http://eprints.iisc.ac.in/id/eprint/44466

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