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

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.

13 pages, 20 figures

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• Tight-binding model and ab initio calculation of silicene with strong spin-orbit coupling in low-energy limit
• Emergent bosons in the fermionic two-leg flux ladder
• Quantum phases of constrained bosons on a two-leg Bose-Hubbard ladder
• Topological bosonic states on ribbons of honeycomb lattice
• Dynamics of interacting bosons in a two-leg ring ladder with artificial magnetic flux and ac-driven modulations