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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultracold Matter (Bosons) I (joint session Q/A)
Q 13.5: Vortrag
Montag, 10. März 2025, 18:00–18:15, HS I PI
Temporal Bistability in the Dissipative Dicke-Bose-Hubbard System — Tianyi Wu1, Fredrik Vermeulen1, •Sayak Ray1, and Johann Kroha1,2 — 1Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 12, 53115 Bonn, Germany — 2School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, KY16 9SS, United Kingdom
We consider a driven-dissipative system consisting of an atomic Bose-Einstein condensate loaded into a two-dimensional Hubbard lattice and coupled to a single mode of an optical cavity. Due to the interplay between strong, repulsive atomic interaction and the atom-cavity coupling, the system exhibits several phases of atoms and photons including the atomic superfluid (SF) and supersolid (SS). We investigate the dynamical behaviour of the system, where we include dissipation by means of the Lindblad master-equation formalism. Due to the discontinuous nature of the Dicke transition for strong atomic repulsion, we find a extended co-existence region of different phases. Such a co-existence, in the limit of vanishing dissipation, is further investigated from the underlying Ginzburg-Landau free energy landscape. We study the resulting, temporal switching dynamics, particularly between the coexisting SF and SS phases, which eventually become damped due to the dissipation.
Reference: Tianyi Wu, Sayak Ray and Johann Kroha, Annalen der Physik, 536, 2300505 (2024).
Keywords: Dicke superradiance; Bose-Hubbard model; Metastability; Superfluid and supersolid; Ginzburg-Landau theory