Pure dephasing increases partition noise in the quantum Hall effect

Physical review. B./Physical review. B, vol. 113

Abstract

Quantum Hall edge channels partition electric charge over N chiral (uni-directional) modes. Intermode scattering leads to partition noise, observed in graphene p-n junctions. While inelastic scattering suppresses this noise by averaging out fluctuations, we show that pure (quasi-elastic) dephasing may enhance the partition noise. The noise power increases by up to 50% for two modes, with a general enhancement factor of 1+1/N in the strong-dephasing limit. This counterintuitive effect is explained in the framework of monitored quantum transport, arising from the self-averaging of quantum trajectories.

Authors 1

1. C. W. J. Beenakker corresponding Aachen

   Leiden University

   Affiliation as printed

   Universiteit Leiden