Complex broadband millimeter wave response of a double quantum dot: Rabi oscillations in an artificial molecule

Complex photoconductive measurements of the current through a double quantum dot enable us to monitor effects of coherent electron transport in the suppression of the rabi oscillations of this “artificial molecule.” The current is induced by a new broadband millimeter wave source functioning as a heterodyne interferometer, which consists of two nonlinear transmission lines generating harmonic outputs in the range 2-400 GHz, and, being coherent, allows tracking the induced current through the sample in both magnitude and phase.