Jeudi 12 juin 2014 à 10h15
Salle 234, Ecole de Physique

Multiple quasiparticle Hall spectroscopy investigated with a resonant detector

Alessandro Braggio, Università di Genova, Italy

We investigate the finite frequency (f.f.) noise properties of edge states in the quantum Hall regime. We consider the measurement scheme of a resonant detector coupled to a quantum point contact in the weak-backscattering limit. A detailed analysis of the difference between the measured noise, due to the presence of the resonant detector, and the symmetrized f.f. noise is presented. We discuss both the Laughlin and Jain sequences, studying the tunnelling excitations in these hierarchical models. We argue that the measured noise can better distinguish between the different excitations in the tunnelling process with respect to the symmetrized f.f. counterpart in an experimentally relevant range of parameters. Finally, we illustrate the effects of the detector temperature on the sensibility of this measure.