Thermoelectric properties of Weyl and Dirac semimetals
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In this paper, 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, was investigated.Abstract:
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.read more
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Journal ArticleDOI
Weyl and Dirac semimetals in three-dimensional solids
TL;DR: Weyl and Dirac semimetals as discussed by the authors are three-dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry, and they have generated much recent interest.
Journal ArticleDOI
The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi.
Max Hirschberger,Satya Kushwaha,Zhijun Wang,Quinn Gibson,Sihang Liang,Carina Belvin,Bogdan Andrei Bernevig,R. J. Cava,Nai Phuan Ong +8 more
TL;DR: A large negative LMR with the field-steering properties specific to the chiral anomaly is observed in the half-Heusler GdPtBi, and the scheme of creating Weyl nodes from quadratic bands suggests that the Chiral anomaly may be observable in a broad class of semimetals.
Journal ArticleDOI
Chiral anomaly and transport in Weyl metals.
TL;DR: The AHE in a Weyl metal is shown to be a purely intrinsic, universal property, fully determined by the location of the Weyl nodes in the first Brillouin zone, and a fully microscopic theory of diffusive magnetotransport in Weyl metals is developed.
Journal ArticleDOI
Experimental signatures of the mixed axial–gravitational anomaly in the Weyl semimetal NbP
Johannes Gooth,Johannes Gooth,Anna Corinna Niemann,Anna Corinna Niemann,Tobias Meng,Adolfo G. Grushin,Karl Landsteiner,Bernd Gotsmann,Fabian Menges,Marcus Schmidt,Chandra Shekhar,Vicky Süß,Ruben Hühne,Bernd Rellinghaus,Claudia Felser,Binghai Yan,Kornelius Nielsch,Kornelius Nielsch +17 more
TL;DR: A positive magneto-thermoelectric conductance in the Weyl semimetal niobium phosphide (NbP) for collinear temperature gradients and magnetic fields that vanishes in the ultra-quantum limit, when only a single Landau level is occupied is consistent with the presence of a mixed axial–gravitational anomaly.
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The Universe in a Helium Droplet
TL;DR: In this article, the authors present a list of the top five most important categories of defense: 1. GRAVITY 7. MICROSCOPIC PHYSICS 13.2.
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