Thermoelectric transport in double-Weyl semimetals

被引:68
作者
Chen, Qi [1 ]
Fiete, Gregory A. [1 ]
机构
[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
基金
美国国家科学基金会;
关键词
DISORDERED DEGENERATE SEMICONDUCTORS; TOPOLOGICAL DIRAC SEMIMETAL; ELECTRONIC-PROPERTIES; FERMION SEMIMETAL; CRITICAL-BEHAVIOR; BERRYS PHASE; TRANSITION; DISCOVERY; GAS;
D O I
10.1103/PhysRevB.93.155125
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the thermoelectric properties of a double-Weyl fermion system, possibly realized in HgCr2Se4 and SrSi2, by a semiclassical Boltzmann transport theory. We investigate different relaxation processes including short-range disorder and electron-electron interaction on the thermoelectric transport coefficients. It is found that the anisotropy of the band dispersion for in-plane and out-of-plane momentum directions affects the relaxation time for transport in different directions. The transport also exhibits an interesting directional dependence on the chemical potential and model parameters, differing from a simple isotropic quadratic or linearly dispersing electron gas. By applying a static magnetic field along the linearly dispersing direction, the longitudinal and transverse electrical and thermal magnetoconductivity show a similar dependence on the in-plane cyclotron frequency to the linear dispersing Weyl nodes. By including internode scattering, we find that the chiral anomaly contribution to the thermoelectric coefficients doubles that of a linearly dispersing Weyl node in both the semiclassical and quantum regimes. A magnetic field applied along the quadratically dispersing direction will split the double-Weyl point into two single-Weyl points with the same chirality.
引用
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页数:16
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