Photon condensation, Van Vleck paramagnetism, and chiral cavities
arXiv:2302.09964 · doi:10.1103/PhysRevResearch.6.013303
Abstract
We introduce a gauge-invariant model of planar, square molecules coupled to a quantized spatially-varying cavity electromagnetic vector potential A(r). Specifically, we choose a temporally chiral cavity hosting a uniform magnetic field B, as this is the simplest instance in which a transverse spatially-varying A(r) is at play. We show that when the molecules are in the Van Vleck paramagnetic regime, an equilibrium quantum phase transition to a photon condensate state occurs.
14 pages, 3 figures
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