Controlling electron propagation on a topological insulator surface via proximity interactions

Article

关键词: THIN-FILMS;    GRAPHENE;    TRANSPORT;    JUNCTIONS;    BI2SE3;    BI2TE3;   

DOI  :  10.1103/PhysRevB.89.045425

来源: SCIE

【 摘 要 】

The possibility of electron beam guiding is theoretically explored on the surface of a topological insulator through the proximity interaction with a magnetic material. The electronic band modification induced by the exchange coupling at the interface defines the path of electron propagation in analogy to the optical fiber for photons. Numerical simulations indicate the guiding efficiency is much higher than that in the waveguide formed by an electrostatic potential barrier such as p-n junctions. Furthermore, the results illustrate effective flux control and beam steering that can be realized by altering the magnetization/spin texture of the adjacent magnetic materials. Specifically, the feasibility to switch on and off and make a large-angle turn is demonstrated under realistic conditions. Potential implementation to logic and interconnect applications is also examined in connection with electrically controlled magnetization switching.

【 授权许可】

Free