Regensburg 2022 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 9: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 2

MM 9.3: Talk

Monday, September 5, 2022, 18:00–18:15, H45

Cavity induced and influenced phases of matter — •Christian J. Eckhardt^{1, 2}, Giacomo Passetti², Marios Michael¹, Frank Schlawin¹, Dante M. Kennes^{2, 1}, and Michael A. Sentef¹ — ¹Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — ²RWTH Aachen University, Aachen, Germany

An optical cavity may be used to influence or induce phases of matter. We discuss how a charge-density wave phase in a 1-dimensional chain of spinless fermions is enhanced through the coupling to the quantized photon field. At the critical point between the Luttinger liquid and the charge-density wave, we find strong light-matter entanglement. Additionally, we ask in what ways photons can be used as pairing glue for superconductivity (SC). We show that a fingerprint feature of such cavity-induced SC is the pickup of a k-dependence of the gap in the electronic spectrum on the Fermi-surface.