Energy-dependent tunnelling from few-electron dynamic quantum dots
Mesoscale and Nanoscale Physics
2009-11-13 v1 Other Condensed Matter
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 tunnelling rates, which change by an order of magnitude with tunnel-barrier gate voltage. We find that the tunnelling 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.
Cite
@article{arxiv.0708.3746,
title = {Energy-dependent tunnelling from few-electron dynamic quantum dots},
author = {M. R. Astley and M. Kataoka and C. J. B. Ford and C. H. W. Barnes and D. Anderson and G. A. C. Jones and I. Farrer and D. A. Ritchie and M. Pepper},
journal= {arXiv preprint arXiv:0708.3746},
year = {2009}
}
Comments
Accepted for publication in Physical Review Letters