Thermal conductance of zero modes on the surface boundary of a Weyl semimetal

Abstract

Thermoelectric conductance of Dirac materials and in particular zero modes reveals the effect of topology .Weyl semimetals with a boundary at z = 0 give rise to chiral zero modes with- out backscattering resulting in a significant contribution to thermal conductivity. By doping the surface with paramagnetic impurities backscattering is allowed, and the thermal conductivity is controlled by the decrease of the transmission function |t|^{2} < 1. We attach a thermal reservoir at the edge of the sample and study the thermal and electrical conductance. For the ballistic and mesoscopic situations, quantum uctuations causes oscillations of the thermal and electric conduc- tance. The thermoelectric conductance varies periodically with the voltage bias. We compare the thermal conductance with and without impurity scattering and observe the effects of topology. An experimental set-up is proposed to test this theory. 1Thermoelectric conductance of Dirac materials and in particular zero modes reveals the effect of topology .Weyl semimetals with a boundary at z = 0 give rise to chiral zero modes with- out backscattering resulting in a significant contribution to thermal conductivity. By doping the surface with paramagnetic impurities backscattering is allowed, and the thermal conductivity is controlled by the decrease of the transmission function |t|^{2} < 1 . We attach a thermal reservoir at the edge of the sample and study the thermal and electrical conductance. For the ballistic and mesoscopic situations, quantum uctuations causes oscillations of the thermal and electric conduc- tance. The thermoelectric conductance varies periodically with the voltage bias. We compare the thermal conductance with and without impurity scattering and observe the effects of topology. An experimental set-up is proposed to test this theory.