Agenda
Histórico

27 de maio de 2024
10:30 hrs
Sala F-147 (IFSC/USP)

Tobias Micklitz
Centro Brasileiro de Pesquisas Físicas

Topology Obstructing Anderson Localization of Light

Light propagation in random media is notorious for a not fully understood resilience to (Anderson) wave localization. We here argue that in materials with slow helicity relaxation previously unnoticed principles of topology reinforce delocalization. Specifically, we demonstrate that the effective electromagnetic action contains Chern-Simons contributions, identical to those protecting delocalization of topological insulator surface states. The length scales over which these terms exert a protective influence depend on the conservation of helicity, leading to the prediction of efficient topological delocalization for scatterers with strong magnetic and electric dipolar resonances.