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arXiv · 1710.08109

Quantum phases of strongly-interacting bosons on a two-leg Haldane ladder

S. Greschner·F. Heidrich-Meisner
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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 hardcore 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.

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S. Greschner, F. Heidrich-Meisner. 2017-10-23. Quantum phases of strongly-interacting bosons on a two-leg Haldane ladder. https://doi.org/10.1103/physreva.97.033619

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