Control of the magnon-photon level attraction in a planar cavity

Hybrid circuits uniting charges, spins, and photons in integrated solid-state devices are seen as crucial to the development of information processing. This work reports an on-chip hybrid device based on the strong coupling between a yttrium iron garnet sphere and microwaves in an interferometric setup, which enables the control of both level repulsion and level attraction. In modeling the system, hybrid circuits are generalized by introducing both mutual capacitance/inductance and mutual resistance. The realization of both coherent and dissipative couplings in a planar cavity may open avenues for the design of dissipatively coupled systems for information processing.