Work

Bound polariton states in the Dicke–Ising model

Year: 2025

Type: article

Abstract: We present a study of hybrid light-matter excitations in cavity QED materials using the Dicke-Ising model as a theoretical framework. Leveraging linear response theory, we derive the exact excitations of the system in the thermodynamic limit. Our results demonstrate that the cavity can localize spin excitations, leading to the formation of bound polaritons, where the cavity acts as an impurity of the two-excitation band, localizing spin-wave pairs around single-spin domains. We derive the condition for the existence of these bound states and discuss its satisfiability in different regimes. Finally, we show that these effects persist in finite systems using exact-diagonalization calculations.

Source: Nanophotonics

DOI: 10.1515/nanoph-2024-0568

Authors: Juan Román‐Roche, Álvaro Gómez‐León, Fernando Luis, David Zueco

Institutions: Universidad de Zaragoza, Instituto de Nanociencia y Materiales de Aragón, Consejo Superior de Investigaciones Científicas, Instituto de Física Fundamental

Language: English

Topic: Strong Light-Matter Interactions

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,995

Funders: Gobierno de Aragón, Agencia Estatal de Investigación