Thermoelectric and thermal transport in doped topologic al insulators Bi₈₈Sb₁₂ and in its field-induced Weyl semimetal phase.

Thermal measurements are often the most revealing transport measurements one can make on quantum materials and devices. The chiral anomaly has been shown in the electrical and in the thermal conductivity in ideal Weyl semimetals induced by a magnetic field in Bi_1-xSb_x alloys that are topological insulators in zero field. [1] In those samples, the chemical potential is fixed at the Weyl point. We report here experimental data that show how changing the chemical potential of those Weyl materials by doping affects the chiral anomaly. We investigated the carrier concentration, thermopower, magnetoresistance and magneto thermal conductivity of both Te doped and Sn doped Bi₈₈Sg₁₂. The magnetic field was applied both along the trigonal direction, which induced the Weyl semimetal phase and in the trigonal plane, which does not.