Observation of microwave absorption and emission from incoherent electron tunneling through a normal-metal-insulator-superconductor junction.

ABSTRACT: We experimentally study nanoscale normal-metal-insulator-superconductor junctions coupled to a superconducting microwave resonator. We observe that bias-voltage-controllable single-electron tunneling through the junctions gives rise to a direct conversion between the electrostatic energy and that of microwave photons. The measured power spectral density of the microwave radiation emitted by the resonator exceeds at high bias voltages that of an equivalent single-mode radiation source at 2.5 K although the phonon and electron reservoirs are at subkelvin temperatures. Measurements of the generated power quantitatively agree with a theoretical model in a wide range of bias voltages. Thus, we have developed a microwave source which is compatible with low-temperature electronics and offers conv

SUBMITTER: Masuda S 

PROVIDER: S-EPMC5834461 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature