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Published on: August 2, 2019
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High-energy quasiparticle injection into mesoscopic superconductors.
Loren D Alegria1, Charlotte G L Bøttcher2, Andrew K Saydjari2
1Department of Physics, Harvard University, Cambridge, MA, USA. lalegria@g.harvard.edu.
Nature Nanotechnology
|January 19, 2021
Summary
Researchers injected high-energy Bogoliubov quasiparticles (QPs) into superconductors using electric fields, observing effects on critical current and enabling new superconducting device designs. This opens avenues for QP-tolerant quantum processors.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Superconductors exhibit Bogoliubov quasiparticles (QPs) at non-zero temperatures.
- Understanding QP dynamics is crucial for quantum information processors.
- Current methods inject QPs at energies near the pairing energy.
Purpose of the Study:
- To explore Bogoliubov quasiparticle (QP) dynamics in mesoscopic superconductors under high electric fields.
- To investigate QP injection at energies significantly exceeding the pairing energy.
- To assess the impact of high-energy QP injection on superconducting properties.
Main Methods:
- Tunnel spectroscopy was performed on a mesoscopic superconductor.
- High electric fields were applied to induce field-emission.
- Gate voltage was used to modulate QP injection and critical current.
Main Results:
- Observed QP injection by field-emitted electrons at energies 10^6 times the pairing energy.
- QP injection decreased the critical current.
- High electric fields induced a transition to the normal state via field-emission current.
Conclusions:
- High-energy QP injection is achievable and affects superconducting states.
- This technique offers potential for developing QP-tolerant quantum processors.
- Enables rapid control of resonator quality factors and novel electric-field-controlled superconducting devices.
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