Astley, MR and Kataoka, M and Ford, CJB and Barnes, CHW and Anderson, D and Jones, GAC and Farrer, I and Ritchie, DA and Pepper, M (2007) Energy-dependent tunneling from few-electron dynamic quantum dots. PHYS REV LETT , 99 (15) , Article 156802. 10.1103/PhysRevLett.99.156802.
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We measure the electron escape rate from surface-acoustic-wave dynamic quantum dots (QDs) through a tunnel barrier. Rate equations are used to extract the tunneling rates, which change by an order of magnitude with tunnel-barrier-gate voltage. We find that the tunneling rates depend on the number of electrons in each dynamic QD because of Coulomb energy. By comparing this dependence to a saddle-point-potential model, the addition energies of the second and third electron in each dynamic QD are estimated. The scale (similar to a few meV) is comparable to those in static QDs as expected.
|Title:||Energy-dependent tunneling from few-electron dynamic quantum dots|
|Open access status:||An open access publication. A version is also available from UCL Discovery.|
|Additional information:||© 2007 The American Physical Society|
|Keywords:||SURFACE ACOUSTIC-WAVES, SPIN, SPECTROSCOPY, COMPUTATION, TRANSPORT, CHANNEL|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering|
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