Thermoelectric properties of Weyl and Dirac semimetals
By Rex Lundgren, P. Laurell, G. Fiete. 2014
178 citations recorded by the source corpus.
We study the electronic contribution to the thermal conductivity and the thermopower of Weyl and Dirac semimetals using a semiclassical Boltzmann approach. We investigate the effect of various relaxation processes including disorder and interactions on the thermoelectric properties, and also consider doping away from the Weyl or Dirac point. We find that the thermal conductivity and thermopower have an interesting dependence on the chemical potential that is characteristic of the linear electronic dispersion, and that the electron-electron interactions modify the Lorenz number. For the interacting system, we also use the Kubo formalism to obtain the transport coefficients. We find exact agreement between the Kubo and Boltzmann approaches at high temperatures. We also consider the effect of electric and magnetic fields on the thermal conductivity in various orientations with respect to the temperature gradient. Notably, when the temperature gradient and magnetic field are parallel, we find a large contribution to the longitudinal thermal conductivity that is quadratic in the magnetic field strength, similar to the magnetic field dependence of the longitudinal electrical conductivity due to the presence of the chiral anomaly when no thermal gradient is present.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/558162ecd57fc40fa254c84cd06747680b70fb74
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
- Ashvin Vishwanath
- N. P. Armitage
- Zhi-xun Shen
- E. Mele
- Xiao-Liang Qi
- Masatoshi Sato
- J. Moore
- Bogdan Andrei Bernevig
Citations in the corpus
- Helicity protected ultrahigh mobility Weyl fermions in NbP (2015, background): “etals (WSMs) are regarded as the next wonderland in condensed matter physics for exploring fascinating quantum phenomena, such as chiral anomaly induced negative MR and quadratic thermal conductivity [7,9,10], symmetry protected helical surface Fermi arcs [11] with unique quantum oscillation [12], a”
- Weyl and Dirac semimetals in three-dimensional solids (2017, methodology): “Lundgren et al., 2014 also considered the effect of electric and magnetic fields on the thermoelectric coefficients.”