Christophe De Beule, Solofo Groenendijk, Tobias Meng, Thomas L. Schmidt
SciPost Phys. 11, 095 (2021) ·
published 23 November 2021
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We investigate transport in type-I/type-II Weyl semimetal heterostructures
that realize effective black- or white-hole event horizons. We provide an exact
solution to the scattering problem at normal incidence and low energies, both
for a sharp and a slowly-varying Weyl cone tilt profile. In the latter case, we
find two channels with transmission amplitudes analogue to those of Hawking
radiation. Whereas the Hawking-like signatures of these two channels cancel in
equilibrium, we demonstrate that one can favor the contribution of either
channel using a non-equilibrium state, either by irradiating the type-II region
or by coupling it to a magnetic lead. This in turn gives rise to a peak in the
two-terminal differential conductance which can serve as an experimental
indicator of the artificial event horizon.
