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TT: Fachverband Tiefe Temperaturen

TT 82: Cryogenic Detectors and Sensors

TT 82.1: Vortrag

Donnerstag, 12. März 2026, 15:00–15:15, HSZ/0103

2D germanium-based micro-bolometers for quantum information readout — •Julius Werner, Martina Trahms, Johannes Höfer, Frederic Gustavo, Jean-Luc Thomassin, Clemens Winkelmann, and Boris Brun — Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG-Pheliqs, Grenoble, France

We develop and investigate micron-scale bolometers based on a two-dimensional hole gas (2DHG) in a Ge/SiGe semiconducting heterostructure. Such devices have promising applications for quantum sensing and the readout of quantum communication signals. The high-transparency interfaces formed between germanium and superconducting aluminum leads allow using the proximity Josephson effect in the 2DHG for thermometry, which is sensitive down to 50 mK. To enable time-resolved thermometry and bolometry with MHz-bandwidth operation, the Josephson inductance is read out via its contribution to a radio-frequency resonant circuit. We present a full thermal balance investigation of the 2DHG-based bolometer at millikelvin temperatures, allowing us to determine the thermal equilibration mechanisms at play and showcase the potential of the Ge 2DHG for quantum heat-detector applications.

Keywords: Bolometer; Thermometry; 2DHG; SNS; photon detection