Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Ultra-cold Atoms, Ions and BEC I (joint session A/Q)

Q 24.1: Talk

Tuesday, March 3, 2026, 11:00–11:15, N 1

Dark-state semi-localization and subradiance in dissipative systems — •Raphaël Menu, Thomas Botzung, and Johannes Schachenmayer — CESQ/ISIS, Université de Strasbourg, Strasbourg, France

Since their discovery, hybrid states of light and matter have sparked bustling interest across diverse fields, ranging from condensed matter physics and atomic physics to chemistry. While "bright" states are largely unaffected by disorder, it has been demonstrated that strong light-matter coupling gives rise to unconventional localization behavior in "dark" light-matter states [1,2]. This phenomenon, coined as semi-localization, has been theoretically evidenced in ensembles of quantum emitters with randomly distributed transition frequencies coupled to a single-mode cavity. However, for meaningful comparison with experimental realizations, a proper description of semi-localization must account for cavity losses and spontaneous emission. In this work, we assess the feasibility of observing semi-localization as a transient phenomenon under experimental conditions [3]. We explore the robustness of this phenomenon in dissipative systems using experimentally accessible figures of merit, and investigate the relation between subradiance and localization phenomena.

[1] T. Botzung & al. Phys. Rev. B 102, 144202 (2020)

[2] J. Dubail & al. Phys. Rev. A 105, 023714 (2022)

[3] M. Baghdad & al, arXiv:2208.12088 (2022)