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超晶格外场下石墨烯和硅烯的谷极化电子性质

Valley-polarized Electronic Properties of Graphene and Silicene under Superlattices
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摘要 以石墨烯为代表的二维六角晶体材料是凝聚态物理和材料物理的研究热点。随着对二维材料的深入研究,Dirac电子的能谷自由度引起了人们极大的关注。类似于自旋电子学,可以利用谷自由度作为信息载体设计新颖的纳米电子器件,即谷电子学。本文首先介绍了石墨烯和硅烯基本的电子性质,然后介绍了谷电子学方面的研究进展。重点回顾并讨论了由磁场、电场、应力场和交换场等构建的几类超晶格外场对Dirac电子能谷和自旋相关物理特性的影响规律。最后是对谷电子性质相关研究的总结和展望。 Two-dimensional hexagonal crystal material such as graphene is an important issue of condensed matter physics and materials physics.With the development of two-dimensional material,the valley degree of freedom has attracted great attention.Similar to spintronics,the valley can be used to store and process information,referred to as valleytronics.This paper introduced the electronic properties of graphene and silicene,and then introduced the progress of valleytronics.We mainly reviewed the valley and spin dependent physical properties of Dirac electron under several kinds of superlattices which are formed by magnetic field,electric field,strain,and exchange field.Finally,it gives a summary and perspective for valleytronics.
作者 卢伟涛 LU Wei-tao(School of Physics and Electronic Engineering,Linyi University,Linyi Shandong 276005,China)
出处 《德州学院学报》 2021年第2期12-18,25,共8页 Journal of Dezhou University
基金 国家自然科学基金(11974153)。
关键词 石墨烯 硅烯 谷极化 自旋极化 超晶格 能带 电子输运 Graphene Silicene Valley polarization Spin polarization Superlattices Band structure Electronic transport
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