Abstract
We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies 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 are comparable to the photon energy leading to observation of the shot noise suppression when . Our measurements provide the first complete test of the finite frequency shot noise scattering theory without adjustable parameters.
- Received 23 April 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.236803
©2007 American Physical Society