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Surface waves and bulk Ruderman mode of a bosonic superfluid vortex crystal in the lowest Landau level
Technische Universität München, Germany; Munich Center for Quantum Science and Technology(MCQST), Germany.ORCID iD: 0000-0001-6627-6737
Technische Universität München, Germany; Munich Center for Quantum Science and Technology (MCQST), Germany.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013). Technische Universität München, Germany; Munich Center for Quantum Science and Technology(MCQST), Germany.ORCID iD: 0000-0002-4615-2507
2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 14, article id 144501Article in journal (Refereed) Published
Abstract [en]

We determine and analyze collective normal modes of a finite disk-shaped two-dimensional vortex crystal formed in a compressible bosonic superfluid in an artificial magnetic field. Using the microscopic Gross-Pitaevskii theory in the lowest Landau level approximation, we generate vortex crystal ground states and solve the Bogoliubov-de Gennes equations for small amplitude collective oscillations. We find chiral surface waves that propagate at frequencies larger than those of the bulk Tkachenko modes. Furthermore, we study low frequency bulk excitations and identify a Ruderman mode, which we find is well described by a previously developed low-energy effective field theory.

Place, publisher, year, edition, pages
American Physical Society, 2022. Vol. 106, no 14, article id 144501
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-92318DOI: 10.1103/PhysRevB.106.144501ISI: 000867634700004Scopus ID: 2-s2.0-85139731266OAI: oai:DiVA.org:kau-92318DiVA, id: diva2:1707009
Funder
Swedish Research Council, 2021-03685German Research Foundation (DFG), EXC2111 -390814868; MO 3013/1-1Available from: 2022-10-28 Created: 2022-10-28 Last updated: 2023-06-20Bibliographically approved

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Moroz, Sergej

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