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arXiv · 1007.0172

Probing the local temperature of a 2DEG microdomain with a quantum dot: measurement of electron-phonon interaction

Simone Gasparinetti·Fabio Deon·Giorgio Biasiol·Lucia Sorba·Fabio Beltram·Francesco Giazotto
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Abstract

We demonstrate local detection of the electron temperature in a two-dimensionalmicrodomain using a quantum dot. Our method relies on the observation that a temperature bias across the dot changes the functional form of Coulomb-blockade peaks. We apply our results to the investigation of electron-energy relaxation at subkelvin temperatures, find that the energy flux from electrons into phonons is proportional to the fifth power of temperature, and give a measurement of the coupling constant.

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Simone Gasparinetti, Fabio Deon, Giorgio Biasiol, Lucia Sorba, Fabio Beltram, Francesco Giazotto. 2012-06-01. Probing the local temperature of a 2DEG microdomain with a quantum dot: measurement of electron-phonon interaction. https://doi.org/10.1103/physrevb.83.201306

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