Spectroscopic signatures of emergent elementary excitations in a kinetically constrained long-range interacting two-dimensional spin system
Phys. Rev. A 113, 043706 – Published 3 April, 2026
DOI: https://doi.org/10.1103/cdz9-rxn2
Abstract
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 with a spectroscopic scheme. Here, we show that the transition rate to certain delocalized superposition states of elementary excitations displays collective many-body enhancement.
