[20p-D104-1~11] 10.4 Semiconductor spintronics, superconductor, multiferroics

[20p-D104-9] High-performance thermoelectrics on ionically disordered topological insulators

〇Takahiro Chiba¹, Saburo Takahashi² (1.NIT-Fukushima Col., 2.IMR-Tohoku Univ.)

Keywords:topological insulator, thermoelectrics, Seebeck effect

We theoretically study the thermoelectric effect on the surface of topological insulators (TIs) that are capped by a ferromagnetic insulator and ionically disordered. Coulomb type long range potential is introduced as the ionic disorders. Based on Boltzmann transport theory at finite temperature, we calculate the Seebeck coefficient and ZT. As a result, we find that ZT can take a large value on the low energy side of the surface band for weak exchange interactions.