Low-temperature magnetotransport in topological Kondo insulator SmB$_6$

The Kondo insulater SmB$_6$ is a promising candidate for realizing a topological Kondo insulator, where topologically non-trivial surface states can be realized in the Kondo hybridization gap driven by strong correlation. Although recent experimental studies have revealed the existence of metallic surface states in SmB$_6$, the non-trivial nature of the surface states remains to be conclusively verified. We report a detailed study of the magnetoresistance of SmB$_6$ at milliKelvin temperatures, reporting strong indications of the topological nature of the surface states in SmB$_6$.