Graphene quantum dots formed by a spatial modulation of the Dirac gap
Graphene quantum dots formed by a spatial modulation of the Dirac gap
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DOI：
10.1063/1.3525858
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发表时间：
2010-12
影响因子：
4
通讯作者：
G. Giavaras;F. Nori
中科院分区：
文献类型：
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作者：
G. Giavaras;F. Nori
由于克莱因隧道效应，静电量子点无法在单层石墨烯中形成。然而，可以借助均匀磁场形成点。如图所示，狄拉克能隙的空间调制会导致具有离散能级的受限状态，从而定义一个点，而无需施加外部电场和磁场。间隙引起的点态可以与静电势引入的态共存并耦合。此属性允许使用电势来调整结果状态局部化的区域。
An electrostatic quantum dot cannot be formed in monolayer graphene because of the Klein tunneling. However, a dot can be formed with the help of a uniform magnetic field. As shown here, a spatial modulation of the Dirac gap leads to confined states with discrete energy levels, thus defining a dot, without applying external electric and magnetic fields. Gap-induced dot states can coexist and couple with states introduced by an electrostatic potential. This property allows the region in which the resulting states are localized to be tuned with the potential.