Double quantum dot as a probe of nonequilibrium charge fluctuations at the quantum point contact

摘要

Absorption of energy quanta generated by a quantum point contact results in the inelastic current through a double quantum dot placed nearby. In contrast to a single quantum dot, the inelastic current through the double quantum dot is determined by the nonlocal current correlations in the quantum point contact, which results in its sensitivity to the energy dependence of the quantum point contact transmission and can lead to suppression of the inelastic current for a substantial range of transport voltages on the quantum point contact. We calculate the inelastic current as a function of microscopic parameters of the circuit.