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Titel: Quantum phases of hardcore bosons with repulsive dipolar density-density interactions on two-dimensional lattices
VerfasserIn: Koziol, J. A.
Morigi, G.
Schmidt, K. P.
Sprache: Englisch
Titel: SciPost Physics
Bandnummer: 17
Heft: 4
Verlag/Plattform: SciPost
Erscheinungsjahr: 2024
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: We analyse the ground-state quantum phase diagram of hardcore Bosons interacting with repulsive dipolar potentials. The bosons dynamics is described by the extended Bose-Hubbard Hamiltonian on a two-dimensional lattice. The ground state results from the interplay between the lattice geometry and the long-range interactions, which we account for by means of a classical spin mean-field approach limited by the size of the considered unit cells. This extended classical spin mean-field theory accounts for the long-range density-density interaction without truncation. We consider three different lattice geometries: square, honeycomb, and triangular. In the limit of zero hopping the ground state is always a devil’s staircase of solid (gapped) phases. Such crystalline phases with broken translational symmetry are robust with respect to finite hopping amplitudes. At intermediate hopping amplitudes, these gapped phases melt, giving rise to various lattice supersolid phases, which can have exotic features with multiple sub lattice densities. At sufficiently large hoppings the ground state is a superfluid. The stability of phases predicted by our approach is gauged by comparison to the known quantum phase diagrams of the Bose-Hubbard model with nearest-neighbour interac tions as well as quantum Monte Carlo simulations for the dipolar case on the square and triangular lattice. Our results are of immediate relevance for experimental reali sations of self-organised crystalline ordering patterns in analogue quantum simulators, e.g., with ultracold dipolar atoms in an optical lattice.
DOI der Erstveröffentlichung: 10.21468/SciPostPhys.17.4.111
URL der Erstveröffentlichung: https://doi.org/10.21468/SciPostPhys.17.4.111
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-456053
hdl:20.500.11880/40115
http://dx.doi.org/10.22028/D291-45605
ISSN: 2542-4653
Datum des Eintrags: 11-Jun-2025
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Physik
Professur: NT - Prof. Dr. Giovanna Morigi
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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