Successful defence of Jue Huang
Congratulations to Jue Huang!
Title: "Epitaxial growth and charge-to-spin conversion studies of Bi2Te3 topological insulator"
As a novel class of materials, topological insulators (TI) have been intensively studied since the first theoretical prediction in 2006 . Bi2Te3, Sb2Te3 and Bi2Se3 compounds were theoretically predicted and experimentally observed as 3D topological insulators, which have a large bulk bandgap, but possess metallic surface states. These spin-polarized surface states have a number of exciting properties such as the spin/momentum locking and suppression of backscattering. The field of TIs leads to potential applications in spintronics and quantum computing, and lots of research efforts are being made. This dissertation explores the charge-to-spin conversion in topological insulator thin films of Bi2Te3 grown by molecular beam epitaxy. It shows a thickness dependent spin torque ratio in ultrathin thickness range (3 QL - 10 QL), where QL refers to quintuple layer.