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Published on: June 8, 2018
Control of Yu-Shiba-Rusinov States through a Bosonic Mode
Helene Müller1,2, Martin Eckstein1, Silvia Viola Kusminskiy2,3
1Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.
Abstract:
We investigate the impact of a bosonic degree of freedom on Yu-Shiba-Rusinov states emerging from a magnetic impurity in a conventional superconductor. Starting from the Anderson impurity model, we predict that an additional p-wave conduction band channel opens up if a bosonic mode is coupled to the tunneling between impurity and host, which implies an additional pair of odd-parity Yu-Shiba-Rusinov states. The bosonic mode can be a vibrational mode or the electromagnetic field in a cavity. The exchange couplings in the two channels depend sensitively on the state of the bosonic mode (ground state, few quanta, or classically driven Floquet state), which opens possibilities for phononics or photonics control of such systems, with a rich variety of ground and excited states.
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