Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact

Eva Zakka-Bajjani (1) , Julien Segala (1) , Fabien Portier (1) , Patrice Roche (1) , Christian D.C. Glattli (1) , Antonella Cavanna (2) , Yong Jin (2)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 LPN - Laboratoire de photonique et de nanostructures

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 $V_{ds}

Mots clés: Shot Noise; High Frequency; Quantum Point Contact

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Eva Zakka-Bajjani, Julien Segala, Fabien Portier, Patrice Roche, Christian D.C. Glattli, et al.. Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact. Physical Review Letters, 2007, 99, pp.236803. ⟨10.1103/PhysRevLett.99.236803⟩. ⟨hal-00140551v4⟩