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Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions.
Ethan G Arnault1, Sara Idris2, Aeron McConnell2
1Department of Physics, Duke University, Durham, North Carolina 27701, United States.
Nano Letters
|August 23, 2022
Summary
Researchers discovered multiplet resonances in multiterminal Josephson junctions (MT-JJs) arising from three-terminal circuit dynamics. These resonances, crucial for understanding Cooper pair splitting and topological states, are observed in graphene devices and simulations.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Multiterminal Josephson junctions (MT-JJs) are key to exploring synthetic topological phases and Floquet states.
- Previous work identified Cooper multiplets involving Cooper pair splitting via Andreev reflections.
Purpose of the Study:
- To investigate the emergence of multiplet resonances in a three-terminal circuit model.
- To demonstrate the dynamical stabilization of supercurrent in MT-JJs.
Main Methods:
- Theoretical analysis of the three-terminal circuit model.
- Experimental realization using nanofabricated three-terminal graphene Josephson junctions (JJs).
- Validation through analog circuit simulations.
Main Results:
- Multiplet resonances observed in three-terminal graphene JJs and circuit simulations.
- Supercurrent stabilization occurs at specific applied bias values (nV1 = -mV2).
- Dynamical stabilization mechanism analogous to Kapitza's inverted pendulum.
Conclusions:
- Three-terminal circuit dynamics can induce multiplet resonances in MT-JJs.
- These findings offer insights into Cooper pair splitting and topological phenomena.
- Provides design considerations for optimizing multiplet line detection in future devices.
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