Thermoelectric properties of inversion symmetry broken Weyl semimetal-Weyl superconductor hybrid junctions

Abstract

We theoretically investigate the thermoelectric properties (electronic contribution) of a hybrid structure comprising of an inversion symmetry broken Weyl semimetal (WSM) and intrinsic Weyl superconductor (WSC) with $s$-wave pairing, employing the Blonder-Tinkham-Klapwijk formulation for non-interacting electrons. Our study unfolds interesting features for various relevant physical quantities such as the thermal conductance, the thermoelectric coefficient and the corresponding figure of merit. We also explore the effects of an interfacial insulating (I) barrier (WSM-I-WSC set-up) on the thermoelectric response in the thin barrier limit. Further, we compute the ratio of the thermal to the electrical conductance in different temperature regimes and find that the Wiedemann-Franz law is violated for small temperatures (below critical temperature $T_c$) near the Weyl points while it saturates to the Lorentz number, away from the Weyl points, at all temperatures irrespective of the barrier strength. We compare and contrast this behaviour with other Dirac material heterostructures and provide a detailed analysis of the thermal transport. Our study can facilitate the fabrication of mesoscopic thermoelectric devices based on WSMs.

This is the published version

References in corpus (17)

• The Chiral Magnetic Effect
• Topological response in Weyl semimetals and the chiral anomaly
• Specular Andreev reflection in graphene
• Thermoelectric properties of Weyl and Dirac semimetals
• The electronic thermal conductivity of graphene
• Superconductivity of doped Weyl semimetals: finite-momentum pairing and electronic analogues of the 3He-A phase
• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Theory of a large thermoeffect in superconductors doped with magnetic impurities
• Thermopower and thermal conductivity in the Weyl semimetal NbP
• Andreev Reflection in Weyl Semimetals
• Heat transport by Dirac fermions in normal/superconducting graphene junctions
• Finite bulk Josephson currents and chirality blockade removal from inter-orbital pairing in magnetic Weyl semimetals
• Thermal conductance by Dirac fermions in a normal-insulator-superconductor junction of silicene
• Appearance of the universal value $e^2/h$ of the zero-bias conductance in a Weyl semimetal-superconductor junction
• Wiedemann-Franz law for massless Dirac fermions with implications for graphene
• Andreev Reflection in Fermi Arc Surface States of Weyl Semimetals
• Spin-dependent thermoelectric effects in graphene based superconductor junctions

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• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions
• Thermoelectric processes of quantum normal-superconductor interfaces
• The orbital-driven topological phase transition and planar Hall responses in ternary tellurides Weyl semi-metals