Valley polarization of electrons in a graphene under modulations of the electrostatic potential barrier and the magnetic field

IF 1.6 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
R. S. Luo, J. D. Lu, X. Y. Li, H. Wang
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引用次数: 0

Abstract

The valley polarization is a fundamental concept in valleytronic applications. However, the combined effects of the electrostatic potential barrier and the magnetic field as well as strains on the valley polarization in a graphene have been rarely reported. Therefore, in this paper, we use the transfer-matrix method to illustrate effects of the height and width of the electrostatic barrier and the strength of the applied magnetic field on the valley polarization of electrons in a graphene, and we find that the valley polarization strongly depends on the strength and width of the electrostatic barrier. We also find that the 100% valley polarization can be achieved continuously and smoothly over a wide range of Fermi energy region by controlling the strength of the applied magnetic field. This point makes it easier to design novel valleytronic devices based on graphene with the presence of the magnetic field and the electrostatic potential barrier as well as strains.

Abstract Image

静电势垒和磁场调制下石墨烯中电子的谷极化
谷极化是谷电子应用中的一个基本概念。然而,静电势垒和磁场以及应变对石墨烯中谷极化的综合影响却鲜有报道。因此,在本文中,我们使用转移矩阵法来说明静电势垒的高度和宽度以及外加磁场强度对石墨烯中电子的谷极化的影响,我们发现谷极化强烈依赖于静电势垒的强度和宽度。我们还发现,通过控制外加磁场的强度,可以在很宽的费米能区范围内连续平稳地实现 100% 的谷极化。这一点使得基于石墨烯的新型谷电器件更容易在磁场和静电势垒以及应变存在的情况下设计出来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indian Journal of Physics
Indian Journal of Physics 物理-物理:综合
CiteScore
3.40
自引率
10.00%
发文量
275
审稿时长
3-8 weeks
期刊介绍: Indian Journal of Physics is a monthly research journal in English published by the Indian Association for the Cultivation of Sciences in collaboration with the Indian Physical Society. The journal publishes refereed papers covering current research in Physics in the following category: Astrophysics, Atmospheric and Space physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear dynamics & Complex Systems; Nuclear Physics; Optics and Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics.
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