Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts

Details Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts

2008-08-21

arxiv.org/abs/0808.2905v2

Phys. Rev. B 79, 035303 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures

Scientific paper

10.1103/PhysRevB.79.035303

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.

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