  Recently, Nation et al confirmed that fluxes of Hawking radiation energy and
entropy from a black hole can be regarded as a one-dimensional (1D) Landauer
transport process. Their work can be extended to background spacetimes with
gauge potential. The result shows that the energy flux, which is indicated to
be equal to the energy-momentum tensor flux, contains not only the contribution
of thermal flux but also that of particle flux. We find that the charge can
also be regarded as transporting via a 1D quantum channel and the charge flux
is equal to the gauge flux.
