Good experimentalists know how to calculate! In our quest to engineer and explore exotic materials, we often need to develop new techniques- on these occasions we grind out theory like the best of 'em (probably not the best of 'em-- we are experimentalists, first and foremost!); recent examples include a Floquet theory of (twisted, aspheric and non-paraxial) optical resonators and a new approach to stabilization of incompressible photonic quantum materials at non-zero chemical potential. See the publications below for details!
R. O. Umucalılar, Jonathan Simon, Iacopo Carusotto, "Autonomous stabilization of photonic Laughlin states through angular momentum potentials" arXiv: 2105.06751
Matt Jaffe, Lukas Palm, Claire Baum, Lavanya Taneja, and Jonathan Simon, "Aberrated optical cavities" arXiv: 2105.05235
Alexandros Georgakopoulos, Ariel Sommer, Jonathan Simon, "Theory of Interacting Cavity Rydberg Polaritons" Quantum Science and Technology, 4, 1
Ruichao Ma, Clai Owens, Andrew Houck, David I Schuster, Jonathan Simon, "An Autonomous Stabilizer for Incompressible Photon Fluids and Solids" Physical Review A 95, 043811
Ruichao Ma, Clai Owens, Aman LaChapelle, David I Schuster, Jonathan Simon, "Hamiltonian tomography of photonic lattices" Physical Review A 95, 062120