Energetics of microwaves probed by double quantum dot absorption

Subhomoy Haldar, Harald Havir, Waqar Khan, Sebastian Lehmann, Claes Thelander, Kimberly A. Dick, Ville F. Maisi

Published 2022-08-02Version 1

We explore the energetics of microwaves interacting with a double quantum dot photodiode structure and show wave and particle aspects in the photon-assisted tunneling. The experiments show that the single-photon energy sets the relevant absorption energy in a weak drive limit, which contrasts the strong-drive limit where the wave-amplitude determines the relevant energy-scale and opens up microwave-induced bias triangles. The energetics of this microwave-assisted charge transport are determined by the detuning conditions of a double dot system and stopping-potential measurements that constitute a microwave version of the photoelectric effect.