Valley filtering in graphene with a Dirac gap
Valley filtering in graphene with a Dirac gap
复制标题
具有狄拉克间隙的石墨烯谷过滤
DOI:
10.1103/physrevb.85.155415
复制
发表时间:
2012-04
影响因子:
3.7
通讯作者:
Kai Chang
中科院分区:
文献类型:
--
作者:
Feng Zhai;Kai Chang
We explore valley filtering in a two-terminal graphene system with a Dirac gap. For such a system with a constant Dirac gap, it is found that the presence of a valley-polarized output current requires both a magnetic barrier and an electric potential. For the magnetic-electric barrier generated by a single ferromagnetic stripe, a remarkable valley polarization can be achieved and is tunable by gate voltages. The generated valley polarization can be detected from the Hall measurement in the outgoing region [Phys. Rev. Lett. 99, 236809 (2007)].