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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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.
|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.|
|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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