Selected Publications
 

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

S. Gasparinetti, F. Deon, G. Biasiol, L. Sorba, F. Beltram, F. Giazotto

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.


Phys. Rev. B 83, 201306(R) (2011)

doi: 10.1103/PhysRevB.83.201306