Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Ultracold Matter IV – Bosons, Rydberg Systems, and Others (joint session Q/A)
A 16.2: Vortrag
Mittwoch, 4. März 2026, 14:45–15:00, P 2
Spectroscopic signatures of emergent elementary excitations in a kinetically constrained long-range interacting two-dimensional spin system — •Tobias Kaltenmark1, Chris Nill1,2, Christian Groß1, and Igor Lesanovsky1,3 — 1Universität Tübingen, Tübingen, Germany — 2University of Bonn, Bonn, Germany — 3The University of Nottingham, Nottingham, United Kingdom
Lattice spin models featuring kinetic constraints constitute a paradigmatic setting for the investigation of glassiness and localization phenomena. The intricate dynamical behavior of these systems is a result of the dramatically reduced connectivity between many-body configurations. This truncation of transition pathways often leads to a fragmentation of the Hilbert space, yielding highly collective and therefore often slow dynamics. Moreover, this mechanism supports the formation of characteristic elementary excitations, which we investigate here theoretically in a two-dimensional Rydberg lattice gas. We explore their properties as a function of interaction strength and range, and illustrate how they can be experimentally probed via sideband spectroscopy. Here, we show that the transition rate to certain delocalized superposition states of elementary excitations displays collective many-body enhancement. This work can be found in (Kaltenmark et al., 2025, arXiv:2511.13279).
Keywords: Rydberg physics; Ising Model; Sideband spectroscopy; Hilbert space fragmentation