Related Experiment Video
Updated: Aug 19, 2025
14:58
Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
Published on: June 3, 2015
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One-Lead Single-Electron Source with Charging Energy
Sung Un Cho1, Wanki Park1, Bum-Kyu Kim2
1Department of Physics & Center for Quantum Coherence in Condensed Matter, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Nano Letters
|November 28, 2022
Summary
We developed a novel single-electron source using quantum dots (QDs) that emits quantized currents of electrons and holes. This breakthrough enables new possibilities in quantum optics and electron devices.
Area of Science:
- Quantum physics
- Mesoscopic physics
- Solid-state physics
Background:
- Single-electron sources are crucial for quantum optics.
- Existing sources have limitations in functionality and control.
Purpose of the Study:
- To develop a novel single-electron source with enhanced functionalities.
- To demonstrate controlled emission of electrons and holes.
- To explore applications in quantum electron devices.
Main Methods:
- Utilizing a quantum dot (QD) coupled to a single lead.
- Employing an AC radiofrequency (rf) drive for particle emission.
- Leveraging significant charging energy within the QD.
- Implementing a potential barrier for particle separation.
- Operating the source in a series double quantum dot geometry.
Main Results:
- Successful successive emission of cotraveling holes and electrons.
- Demonstration of a rectified quantized current.
- Observation of quantized triangular islands in the pump map, matching theoretical predictions.
- Successful parallel electron pumping using a common gate in a double QD setup.
Conclusions:
- The developed single-electron source offers unique functionalities.
- The device enables precise control over electron and hole emission.
- This technology paves the way for advanced quantum electron devices and quantum optics.
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