“Noise on complex quantum Hall edges”

Dr. Jin Hong Park
Department of Condensed Matter Physics,
The Weizmann Institute of Science

Jun. 18 (Mon.), 05:00 PM
E6-2. 2nd fl. #2502

Abstract:
Thermal transport through the edge of quantum Hall systems has been recently investigated since it reveals the topological property to which electron conductance cannot access. We show that noise of an electric current is a result of the interplay between two topological entities, electrical and heat transport.
The noise generated in a line junction system consisting of two counter-propagating modes with filling factor discontinuities $\delta \nu = 1$and $\delta \nu = -1/3$ is suppressed with $1/\sqrt{L}$ as the length $L$ between source and drain varies. This suppression originates from that heat is generated near the drain, is propagating through the line junction in a diffusive way, and mostly contributes to the noise in the vicinity of the source.
Furthermore, we suggest a concrete scheme to measure the noise.