Nanomaterials (Nov 2021)

Thermo-Magneto-Electric Transport through a Torsion Dislocation in a Type I Weyl Semimetal

  • Daniel Bonilla,
  • Enrique Muñoz,
  • Rodrigo Soto-Garrido

DOI
https://doi.org/10.3390/nano11112972
Journal volume & issue
Vol. 11, no. 11
p. 2972

Abstract

Read online

Herein, we study electronic and thermoelectric transport in a type I Weyl semimetal nanojunction, with a torsional dislocation defect, in the presence of an external magnetic field parallel to the dislocation axis. The defect is modeled in a cylindrical geometry, as a combination of a gauge field accounting for torsional strain and a delta-potential barrier for the lattice mismatch effect. In the Landauer formalism, we find that due to the combination of strain and magnetic field, the electric current exhibits chiral valley-polarization, and the conductance displays the signature of Landau levels. We also compute the thermal transport coefficients, where a high thermopower and a large figure of merit are predicted for the junction.

Keywords