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Large Tunable Thermophase in Superconductor - Quantum Dot - Superconductor Josephson Junctions
Yaakov Kleeorin1, Yigal Meir1,2, Francesco Giazotto3
1Department of Physics, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.
Scientific Reports
|October 14, 2016
Summary
Researchers theoretically studied a superconductor-quantum dot-superconductor Josephson junction. This tunable junction exhibits significant thermoelectric effects, breaking particle-hole symmetry to generate a superconducting thermo-phase and thermovoltage.
Area of Science:
- Condensed Matter Physics
- Quantum Phenomena
- Thermoelectric Effects
Background:
- Detecting thermoelectric effects in superconductors is challenging due to particle-hole symmetry.
- Superconductor-Quantum Dot-Superconductor (SC-QD-SC) Josephson junctions offer a potential avenue for investigation.
Purpose of the Study:
- To theoretically investigate the thermoelectric properties of an experimentally accessible SC-QD-SC Josephson junction.
- To demonstrate tunable thermoelectric effects and thermal response in such a system.
Main Methods:
- Utilized Keldysh Green's functions for theoretical analysis.
- Derived the exact thermo-phase and thermal response of the Josephson junction.
Main Results:
- Demonstrated highly tunable thermoelectric properties and significant thermal response.
- Showcased the gradual breaking of particle-hole symmetry by the quantum dot energy level.
- Observed gate-controlled appearance of a superconducting thermo-phase under a temperature gradient, reaching ±π/2.
- Predicted the subsequent development of thermovoltage.
Conclusions:
- The SC-QD-SC Josephson junction provides a viable platform for exploring and controlling thermoelectric effects.
- The proposed theoretical framework and suggested experimental setup can guide future research in this area.
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