Repulsive higher-angular-momentum interactions bind Bogolyubov quasiparticles into subgap excitons that, at surfaces, act as electric-dipole TLS and produce resonator avoided crossings.
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Bogolyubov excitons as a microscopic origin of two-level systems
Repulsive higher-angular-momentum interactions bind Bogolyubov quasiparticles into subgap excitons that, at surfaces, act as electric-dipole TLS and produce resonator avoided crossings.