Nonequilibrium interactions between two quantum circuits

Details Nonequilibrium interactions between two quantum circuits Nonequilibrium interactions between two quantum circuits

2008-05-06

arxiv.org/abs/0805.0724v2

J. Phys.: Condens. Matter 20 (2008) 454205

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Mauterndorf Winterschool-2008 proceedings; as published

Scientific paper

10.1088/0953-8984/20/45/454205

We briefly overview our recent results on nonequilibrium interactions between neighboring electrically isolated nanostructures. One of the nanostructures is represented by an externally biased quantum point contact (drive-QPC), which is used to supply energy quanta to the second nanostructure (detector). Absorption of these nonequilibrium quanta of energy generates a dc-current in the detector, or changes its differential conductance. We present results for a double quantum dot, a single quantum dot or a second QPC placed in the detector circuit. In all three cases a detection of quanta with energies up to ~1 meV is possible for bias voltages across the drive-QPC in the mV range. The results are qualitatively consistent with an energy transfer mechanism based on nonequilibrium acoustic phonons.

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