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arXiv 2301.02480cond-mat.mes-hall
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石墨烯超晶格的有效介质模型及静电和磁矢量势

Effective Medium Model for Graphene Superlattices with Electrostatic and Magnetic Vector Potentials

David E. Fernandes

摘要:

在这篇文章中,我们开发了一个有效的介质模型来描述电子波在石墨烯基纳米结构中的传播,并在其表面施加静电和磁矢量势。我们用数值算法确定了异质结构的有效介质参数,并计算了系统的电子能带结构。我们应用我们的形式主义来分析超晶格与单独的磁势,并揭示了该结构的响应仍然是互惠的,其特征在于电荷载流子的速度降低。我们还研究了超晶格的响应与这两个潜在的叠加在石墨烯和显示系统的响应变得非互易性的色散特征在于由倾斜的狄拉克锥。我们证明,它是可能的交替之间的类型-I,类型-II或类型-III狄拉克锥通过适当地调整电位的振幅。

英文摘要:

In this article we develop an effective medium model to characterize the electron wave propagation in graphene based nanostructures with an electrostatic and magnetic vector potentials imposed on their surface. We use a numerical algorithm to determine the effective medium parameters of the heterostructure and calculate the electronic band structure of the system. We apply our formalism to analyze superlattices with solely a magnetic potential and reveal that the response of the structure remains reciprocal and is characterized by a decrease in charge carrier's velocity. We also study the response of superlattices with both potentials superimposed on graphene and show that the response of the system becomes nonreciprocal with a dispersion characterized by a tilted Dirac cone. We demonstrate that it is possible to alternate between a type-I, type-II or type-III Dirac cones by properly tuning the amplitude of the potentials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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