Bolometric response in graphene based superconducting tunnel junctions

TL;DR

This paper investigates the bolometric response of graphene-based superconducting tunnel junctions, demonstrating their RF response, temperature-dependent resistance, and characterization of key bolometric parameters like heat conductance and responsivity.

Contribution

It provides the first detailed characterization of bolometric parameters in graphene-TiOx-Al tunnel junctions under RF radiation and superconducting conditions.

Findings

Enhanced dynamic resistance below Al's critical temperature

RF radiation causes electronic heating and temperature rise

Measured bolometric parameters include heat conductance and responsivity

Abstract

We fabricate graphene-TiOx-Al tunnel junctions and characterize their radio frequency response. Below the superconducting critical temperature of Al and when biased within the superconducting gap, the devices show enhanced dynamic resistance which increases with decreasing temperature. Application of radio frequency radiation affects the dynamic resistance through electronic heating. The relation between the electron temperature rise and the absorbed radiation power is measured, from which the bolometric parameters, including heat conductance, noise equivalent power and responsivity, are characterized.