Valley polarization in graphene-silicene-graphene heterojunction in zigzag nanoribbon
Valley polarization in graphene-silicene-graphene heterojunction in zigzag nanoribbon
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DOI：
10.1063/1.4883193
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发表时间：
2014-02
影响因子：
3.2
通讯作者：
Man Shen;Yan-Yang Zhang;Xing-Tao An;Jian‐Jun Liu;Shu-Shen Li
中科院分区：
文献类型：
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作者：
Man Shen;Yan-Yang Zhang;Xing-Tao An;Jian‐Jun Liu;Shu-Shen Li
考虑到石墨烯和硅烯能带的差异，我们提出了一种新的石墨烯 - 硅烯 - 石墨烯（GSG）异质结模型。在GSG中，我们研究了在存在外电场的情况下锯齿形纳米带中的谷极化特性。我们发现与硅烯体带隙相关的能量范围内谷极化率超过95%。在硅烯拓扑边缘态的保护下，即使引入小的非磁性无序，谷极化仍然存在。这些结果在未来谷阀的应用中具有一定的实际意义。
Considering the difference of energy bands in graphene and silicene, we put forward a new model of the graphene-silicene-graphene (GSG) heterojunction. In the GSG, we study the valley polarization properties in a zigzag nanoribbon in the presence of an external electric field. We find the energy range associated with the bulk gap of silicene has a valley polarization more than 95%. Under the protection of the topological edge states of the silicene, the valley polarization remains even the small non-magnetic disorder is introduced. These results have certain practical significance in applications for future valley valve.