Tunable valley filtering in graphene with intervalley coupling
1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
2 School of Physics and Telecommunication Engineering, Shanxi University of Technology Hanzhong 723001, China
Received: 27 January 2016
Accepted: 13 May 2016
The valley filtering in normal/valley-coupled/normal graphene junction is investigated theoretically by the mode-matching method. It is shown that the valley-dependent transmission probability in this junction exhibits considerable angle-dependent features. It is also shown that the differential valley transmission PT is an odd function of the incident angle while the total transmission T is an even function of the incident angle. It is also found that the magnitude and sign of the valley polarization component Px of the outgoing current can be effectively changed by tuning the Fermi energy or the electronic potential in the valley-coupled graphene region. These results are very useful for potential valleytronics applications.
PACS: 72.80.Vp – Electronic transport in graphene / 73.23.Ad – Ballistic transport
© EPLA, 2016