Energy levels of hybrid monolayer-bilayer graphene quantum dots

被引：34
|
作者：
Mirzakhani, M. [1 ,2 ]
Zarenia, M. [1 ]
Ketabi, S. A. [2 ]
da Costa, D. R. [3 ]
Peeters, F. M. [1 ,3 ]
机构：
[1] Univ Antwerp, Dept Phys, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
[2] Damghan Univ, Sch Phys, POB 36716-41167, Damghan, Iran
[3] Univ Fed Ceara, Dept Fis, BR-60455900 Fortaleza, Ceara, Brazil
来源：
PHYSICAL REVIEW B | 2016年 / 93卷 / 16期
关键词：
CONFINEMENT;
D O I：
10.1103/PhysRevB.93.165410
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Often real samples of graphene consist of islands of both monolayer and bilayer graphene. Bound states in such hybrid quantum dots are investigated for (i) a circular single-layer graphene quantum dot surrounded by an infinite bilayer graphene sheet and (ii) a circular bilayer graphene quantum dot surrounded by an infinite single-layer graphene. Using the continuum model and applying zigzag boundary conditions at the single-layer-bilayer graphene interface, we obtain analytical results for the energy levels and the corresponding wave spinors. Their dependence on perpendicular magnetic and electric fields are studied for both types of quantum dots. The energy levels exhibit characteristics of interface states, and we find anticrossings and closing of the energy gap in the presence of a bias potential.
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收藏
页数：11
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