Surface transport in Weyl semimetals.

Burrello M.

Relazione su invito
II - Fisica della materia
GSSI Ex ISEF - Aula C - Mercoledì 25 h 10:00 - 13:00
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I will discuss the importance of boundary conditions in calculating the surface transport properties of Weyl semimetals in the ballistic regime. I will analyze, in particular, a minimal model of Weyl semimetal with two Weyl points. In this case, the boundary conditions determine both the pseudospin polarization of the system on the surface and the shape of the associated Fermi arcs. Through field theoretical methods we can derive the density profile of the surface current and evaluate the anomalous Hall conductivity as a function of temperature and chemical potential. I will also analyze the surface anomalous thermal Hall conductivity and show that the boundary properties lead to a correction of the expected universal thermal Hall conductivity, thus violating the Wiedemann-Franz law at temperatures different from zero.

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