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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 15
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Phys. Rev. Lett. 99, 156802 (2007) [4 pages]

Energy-Dependent Tunneling from Few-Electron Dynamic Quantum Dots

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M. R. Astley1,2, M. Kataoka1, C. J. B. Ford1, C. H. W. Barnes1, D. Anderson1, G. A. C. Jones1, I. Farrer1, D. A. Ritchie1, and M. Pepper1,2
1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
2Toshiba Research Europe Limited, Cambridge Research Laboratory, 260 Cambridge Science Park, Cambridge CB4 0WE, United Kingdom

Received 16 May 2007; published 10 October 2007

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 (∼ a few meV) is comparable to those in static QDs as expected.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.156802
DOI:
10.1103/PhysRevLett.99.156802
PACS:
73.23.Hk, 73.50.Rb, 73.63.Kv
 
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