next Q-MAC meetings in 2018:

3rd Q-MAC symposium in Venice, May 22-25, 2018.

Next regular meeting in Paris,       November 27-28, 2018.

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Antoine Georges leads the CCQ in New York

at the newly founded Flatiron Institute of the Simons Foundation.

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Publication Detail / Abstract

A. Tokuno, A. Georges

Ground States of a Bose-Hubbard Ladder in an Artificial Magnetic Field: Field-Theoretical Approach

published in New Journal of Physics on July 2, 2014
> Full text via publisher

We consider a Bose-Hubbard ladder subject to an artificial magnetic flux and discuss its different ground states, their physical properties, and the quantum phase transitions between them. A low-energy effective field theory is derived, in the two distinct regimes of a small and large magnetic flux, using a bosonization technique starting from the weak-coupling limit. Based on this effective field theory, the ground-state phase diagram at a filling of one particle per site is investigated for a small flux and for a flux equal to π per plaquette. For π-flux, this analysis reveals a tricritical point which has been overlooked in previous studies. In addition, the Mott insulating state at a small magnetic flux is found to display Meissner currents.

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