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.
@article{arxiv.0805.0724,
title = {Nonequilibrium interactions between two quantum circuits},
author = {V. S. Khrapai and S. Ludwig and J. P. Kotthaus and H. P. Tranitz and W. Wegscheider},
journal= {arXiv preprint arXiv:0805.0724},
year = {2008}
}
Comments
Mauterndorf Winterschool-2008 proceedings; as published