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Q: Fachverband Quantenoptik und Photonik
Q 37: Polaritonic Effects in Molecular Systems II (joint session MO/Q)
Q 37.2: Vortrag
Mittwoch, 12. März 2025, 11:15–11:30, HS XV
Cavity-mediated electron-electron interactions: Renormalizing Dirac states in graphene — •Hang Liu1, Francesco Troisi1, Hannes Huebener1, Simone Latini1,2, and Angel Rubio1,3 — 1Max Planck Institute for the Structure and Dynamics of Matter, Germany — 2Technical University of Denmark, Denmark — 3The Flatiron Institute, USA
Accurately modeling the interaction between electrons in materials and photon modes within dark cavities is crucial for predicting and understanding cavity-induced phenomena. In this work, we developed the photon-free quantum electrodynamics Hartree-Fock and configuration-interaction frameworks to model the coupling between electrons in crystalline materials and cavity photon modes. We applied these theoretical approaches to investigate the graphene coupled to different types of cavity modes. For a circularly polarized mode, a topological Dirac gap emerges due to cavity-mediated local and nonlocal electron interactions. In contrast, a linearly polarized mode induces a topologically trivial Dirac gap as a result of the cavity-mediated nonlocal electron interactions. Notably, when two cavity modes are introduced, the Dirac cones can remain gapless, but the Fermi velocity is renormalized through cavity-induced nonlocal electron interactions. Our nonperturbative approaches can capture the critical role of cavity-induced nonlocal electron-electron interactions in renormalizing Dirac states in graphene. These new theoretical frameworks pave the way for accurately predicting and exploring novel cavity-induced phenomena in a broader range of material systems.
Keywords: optical cavity; quantum electrodynamics; graphene; Dirac state