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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
Published on: June 3, 2015
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Three-waveform bidirectional pumping of single electrons with a silicon quantum dot
Tuomo Tanttu1,2, Alessandro Rossi2, Kuan Yen Tan1
1Aalto University, QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto, 00076, Finland.
Scientific Reports
|November 9, 2016
Summary
We developed a silicon quantum dot single-electron pump with controllable barrier transparencies. This robust bidirectional pumping technique allows current reversal by adjusting waveform phase shifts, paving the way for quantum standard of the ampere realization.
Area of Science:
- Quantum electronics
- Solid-state physics
- Metrology
Background:
- Quantum dot single-electron pumps are leading candidates for the quantum standard of the ampere.
- Precise control over electron transport is crucial for metrological applications.
Purpose of the Study:
- To demonstrate a silicon quantum dot single-electron pump with advanced radio frequency control.
- To achieve robust bidirectional quantized current pumping.
Main Methods:
- Utilized radio frequency signals to control barrier transparencies and quantum dot potential.
- Implemented a driving protocol with adjustable phase shifts between waveforms.
Main Results:
- Achieved robust bidirectional pumping of single electrons.
- Demonstrated convenient reversal of current direction by altering a single phase shift.
Conclusions:
- The developed pumping technique offers precise control over quantized current.
- This method is promising for realizing the quantum standard of the ampere and future error counting experiments.
