Control of the coupling strength and linewidth of a cavity magnon-polariton
Isabella Boventer, Christine Dörflinger, Tim Wolz, Rair Macêdo, Romain Lebrun, Mathias Kläui, Martin Weides
Abstract
This paper presents a new method to control the coupling strength in cavity-magnon polaritons, that relies on the relative phase and amplitude between two microwave input tones to the cavity-magnon system. The authors show that for certain phases and amplitudes it is possible to enhance or suppress the gap of the avoided level crossing and thus control the coherent information exchange in the system. Further, in the case of the suppression of the frequency gap a strong increase in the signal along with a decrease of the cavity-magnon polariton's linewidth below the geometric mean of the cavity photon's and magnon's linewidth is observed.