SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Weyl Semimetals
MA 39.5: Vortrag
Donnerstag, 30. März 2023, 12:30–12:45, HSZ 403
Novel thermo-electric transport channel in the conformal limit of tilted Weyl semimetals — Thorvald Ballestad1, Alberto Cortijo2, María Vozmediano3, and •Alireza Qaiumzadeh1 — 1Center for Quantum Spintronics, Norwegian University of Science and Technology, Trondheim, Norway — 2Universidad Autonoma de Madrid, Madrid, Spain — 3Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain
Recently, a new contribution to the Nernst current was proposed in 3D Dirac and Weyl semimetals, originated from quantum conformal anomaly [1,2]. In the present study, we analyze the effect of the tilt on the transverse thermo-electric coefficient of Weyl semimetals in the conformal limit, i.e., zero temperature and zero chemical potential. Using the Kubo formalism, we find a non-monotonic behavior of the thermoelectric conductivity as a function of the tilt perpendicular to the magnetic field, and a linear behavior when the tilt is aligned to the magnetic field. An "axial Nernst" current is generated in inversion symmetric materials when the tilt vector has a projection in the direction of the magnetic field. This analysis will help in the design and interpretation of thermo-electric transport experiments in recently discovered topological quantum materials [3].
[1] M. N. Chernodub et al, Phys. Rev. Lett. 120, 206601 (2018). [2] V. Arjona et al, Phys. Rev. B 99, 235123 (2019). [3] T. M Ballestad, A. Cortijo, M. A. H. Vozmediano, A. Qaiumzadeh, arXiv:2209.14331 (2022).