A non-invasive electron thermometer based on charge sensing of a quantum dot

Abstract

We present a thermometry scheme to extract the temperature of a 2DEG by monitoring the charge occupation of a weakly tunnel-coupled 'thermometer' quantum dot using a quantum point contact detector. Electronic temperatures between 97 mK and 307 mK are measured by this method with an accuracy of up to 3 mK, and agree with those obtained by measuring transport through a quantum dot. The thermometer does not pass a current through the 2DEG, and can be incorporated as an add-on to measure the temperature simultaneously with another operating device. Further, the tuning is independent of temperature.

4 pages, 2 figures

References in corpus (4)

• Single-shot read-out of an individual electron spin in a quantum dot
• Local Thermometry of Neutral Modes on the Quantum Hall Edge
• Electron temperature in electrically isolated Si double quantum dots
• Nongalvanic thermometry for ultracold two-dimensional electron domains

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