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Published on: August 2, 2019
Blockade and counterflow supercurrent in exciton-condensate Josephson junctions
Fabrizio Dolcini1, Diego Rainis, Fabio Taddei
1NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy.
Physical Review Letters
|April 7, 2010
Summary
Researchers show perfect conversion between charged supercurrents in superconductors and neutral supercurrents in electron-hole condensates is possible. This coupling modifies superflow, enabling complete blocking or perfect drag depending on phase biases.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- Supercurrents in superconductors are charge-carrying phenomena.
- Electron-hole pair condensates exhibit neutral supercurrents.
- Coupling between these distinct systems is not well understood.
Purpose of the Study:
- To investigate the possibility of interconversion between charged and neutral supercurrents.
- To explore the effects of coupling superconducting circuits via bilayer exciton condensates.
- To identify novel mechanisms governing superflow modification in coupled systems.
Main Methods:
- Theoretical modeling of Andreev-like scattering mechanisms.
- Analysis of coupled superconducting and exciton condensate systems.
- Phase bias manipulation to control supercurrent behavior.
Main Results:
- Demonstration of perfect conversion between charged and neutral supercurrents.
- Observation of drastic modification of superflow in coupled superconducting circuits.
- Identification of phase bias-dependent supercurrent blocking and perfect drag phenomena.
Conclusions:
- A novel Andreev-like scattering mechanism facilitates perfect interconversion of supercurrent types.
- Coupling via bilayer exciton condensates offers significant control over superflow.
- This work opens new avenues for designing advanced superconducting devices and quantum circuits.
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