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Energy-dependent tunneling from few-electron dynamic quantum dots

Astley, MR; Kataoka, M; Ford, CJB; Barnes, CHW; Anderson, D; Jones, GAC; Farrer, I; ... Pepper, M; + view all (2007) Energy-dependent tunneling from few-electron dynamic quantum dots. PHYS REV LETT , 99 (15) , Article 156802. 10.1103/PhysRevLett.99.156802. Green open access

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Abstract

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.

Type: Article
Title: Energy-dependent tunneling from few-electron dynamic quantum dots
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.99.156802
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.99.156802
Language: English
Additional information: © 2007 The American Physical Society
Keywords: SURFACE ACOUSTIC-WAVES, SPIN, SPECTROSCOPY, COMPUTATION, TRANSPORT, CHANNEL
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1311599
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