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

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.

9 pages, 7 figures

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• Acoustic phonon-based interaction between coplanar quantum circuits in magnetic field
• Real-time observation of charge-spin cooperative dynamics driven by a nonequilibrium phonon environment
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