Valley filtering in graphene with a Dirac gap

Valley filtering in graphene with a Dirac gap
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具有狄拉克间隙的石墨烯谷过滤

DOI:
10.1103/physrevb.85.155415
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发表时间:
2012-04
期刊:
影响因子:
3.7
通讯作者:
Kai Chang
Kai Chang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Feng Zhai;Kai Chang

文献摘要

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我们探讨了具有狄拉克能隙的双端石墨烯系统中的谷滤波。对于这样一个系统与一个恒定的狄拉克间隙,它被发现,谷极化的输出电流的存在下,需要一个磁势垒和电势。对于由单个铁磁条产生的磁电势垒,可以实现显著的谷极化,并且可以通过栅极电压进行调节。所产生的谷偏振可以从出射区域中的霍尔测量中检测到[Phys.Rev.Lett. 99,236809(2007)]。
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)].