We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies nu in the range 4-8 GHz. The very small energy scale used ensures energy independent transmissions of the few transmitted electronic modes and their accurate knowledge. Both the thermal energy and the quantum point contact drain-source voltage Vds are comparable to the photon energy hnu leading to observation of the shot noise suppression when Vds<hν/e. Our measurements provide the first complete test of the finite frequency shot noise scattering theory without adjustable parameters.
@article{arxiv.0704.0907,
title = {Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact},
author = {Eva Zakka-Bajjani and Julien Segala and Fabien Portier and Patrice Roche and Christian Glattli and Antonella Cavanna and Yong Jin},
journal= {arXiv preprint arXiv:0704.0907},
year = {2008}
}
Comments
Version Published in Phys. Rev. Lett. (Phys. Rev. Lett. 99, 236803 (2007))