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

Published inPhysical Review. A, vol. 97, no. 3, 033619
Publication date2018

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.

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Citation (ISO format)
GRESCHNER, Sebastian, HEIDRICH-MEISNER, F. Quantum phases of strongly interacting bosons on a two-leg Haldane ladder. In: Physical Review. A, 2018, vol. 97, n° 3, p. 033619. doi: 10.1103/PhysRevA.97.033619
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Article (Accepted version)
ISSN of the journal1050-2947

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