▎ 摘　　要

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 P-T 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 P-x 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. Copyright (C) EPLA, 2016