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Greschner, S.; Heidrich-Meisner, F. (2018): Quantum phases of strongly interacting bosons on a two-leg Haldane ladder. In: Physical Review A, Vol. 97, No. 3, 33619
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Abstract

We study the ground-state physics of a single-component Haldane model on a hexagonal two-leg ladder geometry with a particular focus on strongly interacting bosonic particles. We concentrate our analysis on the regime of less than one particle per unit cell. As a main result, we observe several Meissner-like and vortex-fluid phases, both for a superfluid as well as a Mott-insulating background. Furthermore, we show that for strongly interacting bosonic particles, an unconventional vortex-lattice phase emerges, which is stable even in the regime of hard-core bosons. We discuss the mechanism for its stabilization for finite interactions by a means of an analytical approximation. We show how the different phases may be discerned by measuring the nearest-and next-nearest-neighbor chiral currents as well as their characteristic momentum distributions.