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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)
Q 64.40: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG
Photonic bandgaps and normal mode splitting in lattices interacting with optical cavities — Philippe Wilhelm Courteille1, •Dalila Rivero1, Gustavo Henrique de França1, Claudio Alves Pessoa Junior1, Ana Cipris1, Mayerlin Nuñez Portela2, Raul Teixeira3, and Sebastian Slama4 — 1Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo 13566-970, Brazil — 2Laboratorio de Óptica Cuántica, Universidad de los Andes, A.A. 4976, Bogotá D.C., Colombia — 3Departamento de Física, Universidade Federal de São Carlos, São Carlos, São Paulo 13565-905, Brazil — 4Center for Quantum Sciences and Physikalisches Institut, Eberhard-Karls Universität Tübingen, 72076 Tübingen, Germany
At low optical density, the atom-cavity system is described by the open Dicke model, where collective coupling strength determines the width of normal mode splitting. We apply this to ordered clouds in linear and ring cavities and demonstrate its use in witnessing Wannier-Bloch oscillations. At high optical density, the atomic distribution reshapes the cavity mode, requiring a transfer matrix model. For a periodic atomic lattice, this reveals competing photonic band gaps and normal mode splitting. We discuss the limitations of both models and pathways to more generalized theories.
Keywords: Photonic bandgaps; normal mode splitting; cavities; cold atoms; CQED