Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
Mesoscale and Nanoscale Physics
2009-02-12 v2
Abstract
We investigate experimentally the influence of current flow through two independent quantum point contacts to a nearby double quantum dot realized in a GaAs-AlGaAs heterostructure. The observed current through the double quantum dot can be explained in terms of coupling to a bosonic bath. The temperature of the bath depends on the power generated by the current flow through the quantum point contact. We identify the dominant absorption and emission mechanisms in a double quantum dot as an interaction with acoustic phonons. The experiment excludes coupling of a double quantum dot to shot noise generated by quantum point contact as the dominant mechanism.
Cite
@article{arxiv.0808.2905,
title = {Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts},
author = {U. Gasser and S. Gustavsson and B. Küng and K. Ensslin and T. Ihn and D. C. Driscoll and A. C. Gossard},
journal= {arXiv preprint arXiv:0808.2905},
year = {2009}
}
Comments
9 pages, 7 figures