Microscopic origin of an exceptionally large phonon thermal Hall effect from charge puddles in a topological insulator

Rohit Sharma, Yongjian Wang, Yoichi Ando +2

We present the experimental observation of a drastically enhanced thermal Hall effect in the topological insulator material TlBi${}_{0.15}$Sb${}_{0.85}$Te${}_2$. Although heat transport…