Condensation of vanishing photon emission rates in random atomic clouds

Autor(es)

Viggiano, Viviana ; Bachelard, Romain ; Cunden, Fabio Deelan ; Facchi, Paolo ; Kaiser, Robin ; Pascazio, Saverio ; Pepe, Francesco, V ; Scardicchio, Antonello

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW A; v. 112, n. 1, p. 9-pg., 2025-07-14.

Resumo

In the collective photon emission from atomic clouds both the atomic transition frequency and the decay rate are modified compared to a single isolated atom, leading to the effects of superradiance and subradiance. In this article, we analyze the properties of the Euclidean random matrix associated with the radiative dynamics of a cold atomic cloud, previously investigated in the contexts of photon localization and Dicke super- and subradiance. We present evidence of a phase transition, surprisingly controlled by the cooperativeness parameter, rather than the spatial density or the diagonal disorder. The numerical results corroborate the occurrence of such a phase transition at a critical value of the cooperativeness parameter, above which the lower edge of the spectrum vanishes, exhibiting a macroscopic accumulation of eigenvalues. Independent evaluations based on the two phenomena provide the same value for the critical cooperativeness parameter. (AU)

• Processo FAPESP: 18/15554-5 - Transporte e localização de luz em duas e três dimensões
• Beneficiário: Romain Pierre Marcel Bachelard
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 22/00209-6 - Tecnologias quânticas de segunda geração
• Beneficiário: Celso Jorge Villas-Bôas
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/13143-0 - Átomos frios, fótons, e correlações quânticas
• Beneficiário: Celso Jorge Villas-Bôas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/03300-7 - Localização de luz: Anderson e além
• Beneficiário: Romain Pierre Marcel Bachelard
• Modalidade de apoio: Auxílio à Pesquisa - Regular