Cavity quantum electrodynamics with cyclotron resonance transitions in graphene

Coupling of atomic transitions to the electromagnetic modes of the cavity can be tuned to the ultrastrong coupling regime (USCR) when coupling strength is comparable to the bare energies of the uncoupled excitations. A system of N dipoles coupled to a single cavity mode results in a square root N enhancement of coupling strength. Unlike traditional 2D materials, highly degenerate anharmonic Landau levels of graphene integrated to an optical cavity forms such ensemble of two-level system paving the way for interrogation of this many body system in the USCR. Integrating high mobility encapsulated graphene devices into custom grown Fabry-Perot cavities is one route to probing collective excitations. By performing infrared magneto-spectroscopy on this hybrid system we want to experimentally realize this new regime of quantum light-matter interaction which will enable new avenues of novel quantum optical phenomena and exploration of many body effects inherent to this system.