Resonant Temperature Readout of Monolayer Graphene

Graphene, with its vanishing heat capacity and weak electron-phonon coupling at cryogenic temperatures, is a promising material for ultrasensitive calorimetry and single-photon detection. Here, we present thermometry measurements performed on a tunable graphene Josephson Junction (gJJ) integrated into a resonant microwave circuit. Like other forms of resonant readout, resonant temperature readout has the advantage of being fast, continuously monitorable, and straightforward to frequency multiplex. We present results of heating measurements under electron- and hole-doping, a discussion of physical mechanisms, and performance metrics for use as a bolometer and single-photon detector. Our results pave the way for fast bolometers and calorimeters based on van der Waals materials.