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Surface-acoustic-wave-induced transport in a double quantum dot
W J M Naber1, T Fujisawa, H W Liu
1SRO NanoElectronics, MESA+ Institute for NanoTechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Physical Review Letters
|May 23, 2006
Summary
We observed nonadiabatic transport in a double quantum dot using surface acoustic waves. Electron-phonon interactions were studied, revealing phonon absorption and emission, and nonequilibrium states at higher powers.
Area of Science:
- Condensed Matter Physics
- Quantum Dots
- Acoustics
Background:
- Quantum dots are crucial in quantum computing and electronics.
- Understanding electron-phonon interactions is key to controlling quantum systems.
- Surface acoustic waves offer a tunable method to interact with quantum dots.
Purpose of the Study:
- To investigate nonadiabatic transport in a double quantum dot.
- To explore electron-phonon interactions mediated by surface acoustic waves.
- To characterize the system's behavior under varying acoustic power levels.
Main Methods:
- Fabrication of an on-chip double quantum dot system.
- Irradiation of the double quantum dot with surface acoustic waves.
- Measurement of transport properties under acoustic wave irradiation.
Main Results:
- Observed absorption and emission of single and multiple phonons at low acoustic power.
- Demonstrated sequential phonon-assisted tunneling processes at higher acoustic power.
- Induced a highly nonequilibrium state in the double quantum dot system.
Conclusions:
- The double quantum dot system effectively exhibits nonadiabatic transport.
- Surface acoustic waves provide a powerful tool to study electron-phonon interactions.
- The system is a promising platform for fundamental research in quantum acoustics and solid-state physics.
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