SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Poster Session: Topology

TT 25.7: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

Artificial event horizons in Weyl semimetal heterostructures and their non-equilibrium signatures — •Christophe De Beule¹, Solofo Groenendijk¹, Tobias Meng², and Thomas L. Schmidt¹ — ¹Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg, Luxembourg — ²Institute for Theoretical Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01069 Dresden, Germany

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.