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Published on: March 24, 2019
Long-range phase coherence and tunable second order φ 0-Josephson effect in a Dirac semimetal 1T-PtTe2
Pranava K Sivakumar1, Mostafa T Ahari2, Jae-Keun Kim1
1Max Planck Institute of Microstructure Physics, 06120 Halle (Saale), Germany.
Researchers discovered a significant Josephson diode effect in 1T-PtTe2, a type-II Dirac semimetal. This effect, driven by spin-momentum locking, shows potential for superconducting logic circuits.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum electronics
Background:
- Superconducting diode effects are crucial for superconducting logic circuits.
- Non-reciprocal critical currents are key to diode effects.
- Existing methods often involve complex junction designs.
Purpose of the Study:
- To establish and characterize the Josephson diode effect in 1T-PtTe2.
- To differentiate the effect from extrinsic geometric influences.
- To explore the role of spin-momentum locking in this phenomenon.
Main Methods:
- Fabrication of Josephson junctions using 1T-PtTe2.
- Measurement of supercurrents and critical currents.
- Analysis of second-harmonic components and magnetic field dependence.
Main Results:
- Demonstrated a large Josephson diode effect in 1T-PtTe2.
- Correlated the diode effect magnitude with the second-harmonic supercurrent.
- Identified tunable second order φ0-junctions controlled by magnetic fields.
Conclusions:
- 1T-PtTe2 exhibits a robust Josephson diode effect due to intrinsic properties.
- The material offers a promising platform for studying diode effects and quantum transport.
- Tunable junctions pave the way for advanced superconducting devices.
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