{"title":"Valley polarization of electrons in a graphene under modulations of the electrostatic potential barrier and the magnetic field","authors":"R. S. Luo, J. D. Lu, X. Y. Li, H. Wang","doi":"10.1007/s12648-024-03390-2","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Indian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s12648-024-03390-2","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.