Cavity QED Control of Quantum Condensed Matter*

In this poster presentation I will give an overview of different condensed matter systems under strong and ultrastrong coupling to cavity vacuum fluctuations. I will discuss analytically solvable condensed matter models coupled to the cavity vacuum field, and how fundamental properties of condensed matter can be modified. I will focus on the two-dimensional free electron gas [1] and and on quantum Hall systems under cavity coupling [2]. I will show how the correlated light-matter ground-state gets populated by virtual photons which then modify conduction properties of the condesed matter system. Connections to recent experiments will also be discussed.

[1] V. Rokaj, M. Ruggenthaler, F. G. Eich, and A. Rubio, Phys. Rev. Research 4, 013012 (2022)

[2] V. Rokaj, J. Wang, J. Sous, M. Penz, M. Ruggenthaler, and A. Rubio, Phys. Rev. Lett. 131, 196602 (2023)