2025/02/21 by Omid Sharifi Sedeh, C. P. Scheller, Sedeh, Omid Sharifi +11
Engineering · Physics and Astronomy · #Advanced Sensor Technologies Research #Applied Physics (physics.app-ph) #Calibration and Measurement Techniques #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nuclear Physics and Applications
paper · pdf · doi:10.48550/arxiv.2502.15904
openalex publication_date 2025/02/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Coulomb blockade thermometers (CBTs) are versatile and, in principle, primary thermometers operating down to the micro-Kelvin range but bias heating spoils the thermometry and the primary mode. Here, we introduce a method to extract the CBT electron temperature in the presence of heat created by an arbitrary bias voltage, and without assumptions on the heat flow mechanisms. The charging energy is extracted with high precision and without any other knowledge, thus making true primary thermometry possible. The experiment also reveals a subtle dependence of the charging energy on phonon temperature below 100 mK likely due to the amorphous AlOx tunnel junctions.