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Phase engineering of anomalous Josephson effect derived from Andreev molecules
Sadashige Matsuo1, Takaya Imoto1,2, Tomohiro Yokoyama3
1Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan.
Science Advances
|December 13, 2023
Summary
Researchers demonstrated nonlocal control of supercurrent in coupled Josephson junctions (JJs), forming Andreev molecules. This anomalous Josephson effect enables finite supercurrent without local phase difference, paving the way for novel superconducting devices.
Area of Science:
- Condensed Matter Physics
- Quantum Electronics
- Superconductivity
Background:
- Josephson junctions (JJs) are fundamental to superconducting circuits, with supercurrent controlled by electrode phase difference.
- Coupling two JJs into Andreev molecules allows for nonlocal control of supercurrent in one JJ by another.
Purpose of the Study:
- To investigate the nonlocal control of supercurrent in coupled Josephson junctions.
- To analyze the anomalous Josephson effect in Andreev molecules.
Main Methods:
- Evaluating supercurrent in one JJ within a coupled system.
- Analyzing supercurrent as a function of local and nonlocal phase differences.
Main Results:
- Nonlocal phase control generates a finite supercurrent even with zero local phase difference.
- The offset of the local phase difference for the JJ ground state is dependent on the nonlocal phase difference.
- Demonstrated anomalous Josephson effect via nonlocal phase control.
Conclusions:
- Nonlocal phase control in Andreev molecules offers a new mechanism for manipulating supercurrent.
- This phenomenon provides a basis for engineering advanced superconducting devices like phase batteries and dissipationless rectifiers.
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