Cavity vacuum fields in ultra-strong coupling reduce the effective degeneracy of Landau levels in graphene, shifting quantum Hall features to densities more than 20% lower and producing a nonlinear Landau fan.
Enkner et al., Testing the Renormalization of the von Klitzing Constant by Cavity Vacuum Fields
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Observation of Cavity-Mediated Nonlinear Landau Fan and Modified Landau Level Degeneracy in Graphene Quantum Transport
Cavity vacuum fields in ultra-strong coupling reduce the effective degeneracy of Landau levels in graphene, shifting quantum Hall features to densities more than 20% lower and producing a nonlinear Landau fan.