Dirac fermion metagratings in graphene

Abstract We theoretically demonstrate a Dirac fermion metagrating which is an artificially engineered material in graphene. Although its physics mechanism is different from that of optical metagrating, both of them can deliver waves to one desired diffraction order. Here we design the metagrating as...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Pengcheng Wan, Yinghui Ren, Qianjing Wang, Di Huang, Ling Zhou, Haiqin Guo, Junjie Du
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/1a01816211a64ed0a9fefd9c05779ac5
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:1a01816211a64ed0a9fefd9c05779ac5
record_format	dspace
spelling	oai:doaj.org-article:1a01816211a64ed0a9fefd9c05779ac52021-12-02T14:25:14ZDirac fermion metagratings in graphene10.1038/s41699-021-00222-32397-7132https://doaj.org/article/1a01816211a64ed0a9fefd9c05779ac52021-04-01T00:00:00Zhttps://doi.org/10.1038/s41699-021-00222-3https://doaj.org/toc/2397-7132Abstract We theoretically demonstrate a Dirac fermion metagrating which is an artificially engineered material in graphene. Although its physics mechanism is different from that of optical metagrating, both of them can deliver waves to one desired diffraction order. Here we design the metagrating as a linear array of bias-tunable quantum dots to engineer electron beams to travel along the -1st-order transmission direction with unity efficiency. Equivalently, electron waves are deflected by an arbitrary large-angle ranging from 90° to 180° by controlling the bias. The propagation direction changes abruptly without the necessity of a large transition distance. This effect is irrelevant to complete band gaps and thus the advantages of graphene with high mobility are not destroyed. This can be attributed to the whispering-gallery modes, which evolve with the angle of incidence to completely suppress the other diffraction orders supported by the metagrating and produce unity-efficiency beam deflection by enhancing the -1st transmitted diffraction order. The concept of Dirac fermion metagratings opens up a new paradigm in electron beam steering and could be applied to achieve two-dimensional electronic holography.Pengcheng WanYinghui RenQianjing WangDi HuangLing ZhouHaiqin GuoJunjie DuNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Pengcheng Wan Yinghui Ren Qianjing Wang Di Huang Ling Zhou Haiqin Guo Junjie Du Dirac fermion metagratings in graphene
description	Abstract We theoretically demonstrate a Dirac fermion metagrating which is an artificially engineered material in graphene. Although its physics mechanism is different from that of optical metagrating, both of them can deliver waves to one desired diffraction order. Here we design the metagrating as a linear array of bias-tunable quantum dots to engineer electron beams to travel along the -1st-order transmission direction with unity efficiency. Equivalently, electron waves are deflected by an arbitrary large-angle ranging from 90° to 180° by controlling the bias. The propagation direction changes abruptly without the necessity of a large transition distance. This effect is irrelevant to complete band gaps and thus the advantages of graphene with high mobility are not destroyed. This can be attributed to the whispering-gallery modes, which evolve with the angle of incidence to completely suppress the other diffraction orders supported by the metagrating and produce unity-efficiency beam deflection by enhancing the -1st transmitted diffraction order. The concept of Dirac fermion metagratings opens up a new paradigm in electron beam steering and could be applied to achieve two-dimensional electronic holography.
format	article
author	Pengcheng Wan Yinghui Ren Qianjing Wang Di Huang Ling Zhou Haiqin Guo Junjie Du
author_facet	Pengcheng Wan Yinghui Ren Qianjing Wang Di Huang Ling Zhou Haiqin Guo Junjie Du
author_sort	Pengcheng Wan
title	Dirac fermion metagratings in graphene
title_short	Dirac fermion metagratings in graphene
title_full	Dirac fermion metagratings in graphene
title_fullStr	Dirac fermion metagratings in graphene
title_full_unstemmed	Dirac fermion metagratings in graphene
title_sort	dirac fermion metagratings in graphene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1a01816211a64ed0a9fefd9c05779ac5
work_keys_str_mv	AT pengchengwan diracfermionmetagratingsingraphene AT yinghuiren diracfermionmetagratingsingraphene AT qianjingwang diracfermionmetagratingsingraphene AT dihuang diracfermionmetagratingsingraphene AT lingzhou diracfermionmetagratingsingraphene AT haiqinguo diracfermionmetagratingsingraphene AT junjiedu diracfermionmetagratingsingraphene
_version_	1718391412184055808

Dirac fermion metagratings in graphene

Ejemplares similares