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Enhanced Cooper-Pair Injection into a Semiconductor Structure by Resonant Tunneling
Shlomi Bouscher1, Dmitry Panna1, Krishna Balasubramanian1
1Department of Electrical Engineering, Technion, Haifa 32000, Israel.
We enhanced Cooper-pair injection efficiency in superconductor-semiconductor devices by utilizing resonant states. This breakthrough in Andreev reflection paves the way for advanced quantum technologies.
Area of Science:
- Condensed matter physics
- Quantum technologies
- Superconductor-semiconductor hybrid devices
Background:
- Superconductor-semiconductor hybrid devices are crucial for advancing quantum technologies.
- Efficient Cooper-pair injection is essential for many superconducting applications.
Purpose of the Study:
- To demonstrate enhanced Andreev reflection and Cooper-pair injection efficiency.
- To investigate the role of resonant states in superconductor-semiconductor interfaces.
Main Methods:
- Fabrication of Nb/InGaAs/InP-based hybrid devices.
- Measurement and analysis of differential conductance spectra.
- Theoretical modeling using a numerical approach.
Main Results:
- Observed resonant features and significantly enhanced Cooper-pair injection in samples with resonant states.
- Demonstrated a lack of Cooper-pair injection in nonresonant samples.
- Experimental data showed excellent agreement with theoretical modeling.
Conclusions:
- Cooper-pair tunneling into semiconductor quantum well resonant states enhances Andreev reflection.
- Findings support the development of novel quantum technologies like superconducting light-emitting diodes.
- Opens new avenues in condensed matter physics and quantum information science.
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