ELECTRON OPTICS WITH DIRAC FERMIONS: ELECTRON TRANSPORT IN MONOLAYER AND BILAYER GRAPHENE THROUGH MAGNETIC BARRIER AND THEIR SUPERLATTICES
ELECTRON OPTICS WITH DIRAC FERMIONS: ELECTRON TRANSPORT IN MONOLAYER AND BILAYER GRAPHENE THROUGH MAGNETIC BARRIER AND THEIR SUPERLATTICES
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DOI：
10.1142/s0217979213410038
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发表时间：
2013-04-20
影响因子：
1.7
通讯作者：
Sharma, Manish
中科院分区：
文献类型：
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作者：
Agrawal (Garg), Neetu;Ghosh, Sankalpa;Sharma, Manish
在这篇综述文章中，我们讨论了最近的进展，研究弹道输运的电荷载流子在石墨烯通过高度不均匀的磁场称为磁势垒结合栅极电压诱导的静电势。从单磁势垒或双磁势垒的情况开始，我们还回顾了在理解电子输运通过这种电磁势垒产生的超晶格方面的进展，并讨论了实验实现这种系统的可能性。特别强调的是，这种传输与光波通过介质的传播具有交变介电常数的类比。在这个方向上，我们讨论了电子模拟的光学现象，如法布里-珀罗共振，负折射，古斯-汉臣效应，光束准直在这样的系统，并解释这样的类比是如何将是有用的设备生成。由此产生的狄拉克费米子的能带结构的修改，额外的狄拉克点的出现也进行了讨论，伴随着相对论狄拉克费米子的电场和磁场的相互转换的简短部分。我们还讨论了这种电磁势垒的影响双层石墨烯（BLG）在类似的框架。
In this review article we discuss the recent progress in studying ballistic transport for charge carriers in graphene through highly inhomogeneous magnetic field known as magnetic barrier in combination with gate voltage induced electrostatic potential. Starting with cases for a single or double magnetic barrier we also review the progress in understanding electron transport through the superlattices created out of such electromagnetic potential barriers and discuss the possibility of experimental realization of such systems. The emphasis is particularly on the analogy of such transport with propagation of light wave through medium with alternating dielectric constant. In that direction we discuss electron analogue of optical phenomena like Fabry-Perot resonances, negative refraction, Goos- Hanchen effect, beam collimation in such systems and explain how such analogy is going to be useful for device generation. The resulting modification of band structure of Dirac fermions, the emergence of additional Dirac points was also discussed accompanied by brief section on the interconvertibility of electric and magnetic field for relativistic Dirac fermions. We also discuss the effect of such electromagnetic potential barrier on bilayer graphene (BLG) in a similar framework.