Phonon excitations of Floquet-driven superfluids in a tilted optical lattice

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Cruickshank, Robbie and Carli, Andrea Di and Mitchell, Matthew and Rooij, Arthur La and Kuhr, Stefan and Creffield, Charles E. and Haller, Elmar (2024) Phonon excitations of Floquet-driven superfluids in a tilted optical lattice. Physical Review Research, 6 (2). 023323. ISSN 2643-1564 (https://doi.org/10.1103/PhysRevResearch.6.023323)

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Abstract

Tilted lattice potentials with periodic driving play a crucial role in the study of artificial gauge fields and topological phases with ultracold quantum gases. However, driving-induced heating and the growth of phonon modes restrict their use for probing interacting many-body states. Here, we experimentally investigate phonon modes and interaction-driven instabilities of superfluids in the lowest band of a shaken optical lattice. We identify stable and unstable parameter regions and provide a general resonance condition. In contrast to the high-frequency approximation of a Floquet description, we use the micromotion of the superfluids to analyze the growth of phonon modes from slow- to fast-driving frequencies. The model describes phonon excitations in both resonantly and nonresonantly driven systems, with or without a tilted potential. Our observations enable the prediction of stable parameter regimes for quantum-simulation experiments aimed at studying driven systems with strong interactions over extended time scales.

ORCID iDs

Cruickshank, Robbie ORCID logoORCID: https://orcid.org/0009-0004-8662-294X, Carli, Andrea Di ORCID logoORCID: https://orcid.org/0000-0003-0377-6886, Mitchell, Matthew, Rooij, Arthur La, Kuhr, Stefan ORCID logoORCID: https://orcid.org/0000-0001-8386-5357, Creffield, Charles E. and Haller, Elmar ORCID logoORCID: https://orcid.org/0000-0002-7951-1721;
  • Item type:Article
    ID code:89768
    Dates:
    Date
    Event
    25 June 2024
    Published
    18 May 2024
    Accepted
    10 January 2024
    Submitted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:28 Jun 2024 08:42
    Last modified:15 Dec 2024 01:43
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/89768
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