Thermoelectric transport of the coexistence topological semimetal in the quantum limit
Abstract: We explore the thermoelectric transport properties of a coexistence topological semimetal, characterized by the presence of both a pair of Weyl points and a nodal ring in the quantum limit. This system gives rise to complex Landau bands when subjected to a magnetic field aligned with the direction connecting two Weyl points. In the longitudinal configuration, where the magnetic field is parallel to the electric field or the temperature gradient, the thermoelectric conductivity indicates a plateau independent of the magnetic field and the Fermi energy at $\delta$-form short-range scattering. This platform structure should also exist in pure two-node Weyl semimetals. However, the thermoelectric conductivity and the Seebeck coefficient are significantly influenced by the parameters of long-ranged Gaussian or screened Coulomb scattering potentials for both fixed carrier density and Fermi energy scenarios. In the transverse configuration, both Gaussian and screened Coulomb scatterings yield substantial positive magnetoresistance and thermoelectric conductance. Since the Hall conductivity is larger than the longitudinal one, the Seebeck coefficient, exhibiting a quadratic increase with the magnetic field, is close to the dissipationless limit irrespective of scatterings, while the Nernst response is notably dependent on the scattering mechanism. Additionally, the model parameter, distinct from the two-node Weyl model, influences the thermoelectric transport properties. The magnetic field response of the thermoelectric coefficients to different scattering potentials can be used as a basis for distinguishing scattering mechanisms in materials.
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