Quantum oscillations and nontrivial transport in (Bi_0.92In_0.08)₂Se₃

Quantum phase transition in topological insulators has drawn heightened attention in condensed matter physics and future device applications. Here we report the magnetotransport properties of single crystalline (Bi_0.92In_0.08)₂Se₃. The average mobility of $\sim 1000{cm}^2\cdot V^{-1}\cdot s^{-1}$ is obtained from the Lorentz law at the low field ($<3T$) up to 50 K. The quantum oscillations rise at a field of $\sim 5T$, revealing a high mobility of $\sim 1.4\times {10}^4{cm}^2\cdot V^{-1}\cdot s^{-1}$ at 2 K. The Dirac surface state is evident by the nontrivial Berry phase in the Landau–Fan diagram. The properties make the (Bi_0.92In_0.08)₂Se₃ a promising platform for the investigation of quantum phase transition in topological insulators. (rapid communication)