Spin Transport in a Semiconductor Channel

From QCLab
  • Speaker: Hyun Cheol Koo (KIST)
  • Date: Wednesday March 9, 2016 17:00
  • Place: Asan Science Building, Room 199

In the field of semiconductor spintronics, coherent spin precession in a Rashba effective magnetic field in the channel of a spin field effect transistor and the spin Hall effect are the two most compelling topics. In this talk, the experimental results of spin injection and gate control of spin precession is presented. The original Datta-Das prediction of a gate voltage controlled conductance oscillation in a spin injected field effect transistor (Spin-FET), caused by coherent spin precession in a Rashba spin-orbit system, is the cornerstone of semiconductor spintronics research. Our result is the first experimental observation and confirmation of the Datta-Das prediction. We also combine spin Hall and Rashba effects to provide two novel results: a direct demonstration of the ballistic spin Hall effect and a new technique for an all-electric measurement of the Datta–Das conductance oscillation.