Probing the local temperature of a 2DEG microdomain with a quantum dot: measurement of electron-phonon interaction
arXiv:1007.0172 · doi:10.1103/PhysRevB.83.201306
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.
5 pages, 4 figures
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