Topological Classification of Shot Noise on Fractional Quantum Hall Edges.

Abstract

Electrical and thermal transport on a fractional quantum Hall edge are determined by topological quantities inherited from the corresponding bulk state. While electrical transport is the standard method for studying edges, thermal transport appears more challenging. Here, we show that the shot noise generated on the edge provides a fully electrical method to probe the edge structure. In the incoherent regime, the noise falls into three topologically distinct universality classes: charge transport is always ballistic while thermal transport is either ballistic, diffusive, or "antiballistic." Correspondingly, the noise either vanishes, decays algebraically, or is constant up to exponentially small corrections in the edge length.