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


Autoria(s): Dhar, Arya; Maji, Maheswar; Mishra, Tapan; Pai, RV; Mukerjee, Subroto; Paramekanti, Arun
Data(s)

11/04/2012

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/44466/1/PhysRevA.85.041602.pdf

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).

Publicador

The American Physical Society

Relação

http://pra.aps.org/abstract/PRA/v85/i4/e041602

http://eprints.iisc.ernet.in/44466/

Palavras-Chave #Others #Physics
Tipo

Journal Article

PeerReviewed