Kataoka, M and Astley, MR and Thorn, AL and Oi, DKL and Barnes, CHW and Ford, CJB and Anderson, D and Jones, GAC and Farrer, I and Ritchie, DA and Pepper, M (2009) Coherent Time Evolution of a Single-Electron Wave Function. PHYS REV LETT , 102 (15) , Article 156801. 10.1103/PhysRevLett.102.156801.
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Abstract
Observation of coherent single-electron dynamics is severely limited by experimental bandwidth. We present a method to overcome this using moving quantum dots defined by surface acoustic waves. Each dot holds a single electron, and travels through a static potential landscape. When the dot passes abruptly between regions of different confinement, the electron is excited into a superposition of states, and oscillates unitarily from side to side. We detect these oscillations by using a weak, repeated measurement of the current across a tunnel barrier, and find close agreement with simulations.
| Type: | Article |
|---|---|
| Title: | Coherent Time Evolution of a Single-Electron Wave Function |
| Open access status: | An open access publication. A version is also available from UCL Discovery. |
| DOI: | 10.1103/PhysRevLett.102.156801 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.102.156801 |
| Language: | English |
| Additional information: | © 2009 The American Physical Society |
| Keywords: | SURFACE ACOUSTIC-WAVES, QUANTUM DOTS, COMPUTATION, CHANNEL, STATES, SPIN |
| UCL classification: | UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering |
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