IFIMAC+ICMM Joint Seminar Series focuses on cutting-edge research on condensed matter physics, bringing speakers from all over the world to our Cantoblanco Campus. All talks are streamed online. Some of them will be celebrated on campus and onsite participation will also be possible. You need to subscribe to our mailing list at the link provided below to get the links to the seminar room. https://listas-correo.uam.es/sympa/subscribe/seminarios-ifimac-icmm-l

Matter in non-perturbative cavity QED

David Zueco, Instituto de Nanociencia y Materiales de Aragón, CSIC and Universidad de Zaragoza

Hybrid, December 9th (Thursday), 2021, 16:00 CET

On-site venue:

Sala de Seminarios, 5ª planta, Módulo 5, Facultad de Ciencias, Universidad Autónoma de Madrid (Spain).

In this seminar, we discuss the theory of a general material system of N particles coupled to a cavity. We focus on equilibrium. We use bounds for the partition function and a a coherent-state path integral formulation. We obtain the exact (non-local) action wherethe photonic degrees of freedom are replaced by an effective position-dependent interaction between the particles. Besides, in the large-N limit, we show that the theory can be cast into an effective Hamiltonian where the cavity induced interactions are made explicit. We showcase the descriptive power of the formalism with three examples: photon condensation, the 2D free electron gas in a cavity and the modification of magnetic interactions between molecular spins; recovering, condensing and extending some recent results in the literature. We delve into the example of modifying magnetic interactions anticipating the first experimental steps.