Nonequilibrium interactions between two quantum circuits

Abstract

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.

Mauterndorf Winterschool-2008 proceedings; as published

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Cited by in corpus (5)

• Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
• Heat driven transport in serial double quantum dot devices
• Relaxation of hot electrons in a degenerate two-dimensional electron system: transition to one-dimensional scattering
• Acoustic phonon-based interaction between coplanar quantum circuits in magnetic field
• Quantum thermocouples: nonlocal conversion and control of heat in nanostructures