Conductance Quantization and Magnetic Control of Topological Insulators

• Speaker: kim, Jae Hoon (Department of Physics, Yonsei University, Korea)

Topological insulators as well as related topological materials are likely to provide us with an ideal materials base for fault-tolerant topological quantum computing in the near future. In this talk, I will review current research on the detection, manipulation, and hybridization of topological surfaces states in topological insulators. Conductance quantization in the ambient in units of the fundamental conductance quantum has been established in ultrathin films in which the top and bottom surface states are strongly hybridized. External magnetic fields and exchange interaction further modify these quantum states. We employ various experimental techniques including MBE film synthesis, terahertz time domain spectroscopy, and magnetooptical polarimetry for our investigation.