Tuning the Fermi velocity in Dirac materials with an electric field

Abstract Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	A. Díaz-Fernández, Leonor Chico, J. W. González, F. Domínguez-Adame
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9d8ed2283b7f4e19bcba6a1737160bb5
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:9d8ed2283b7f4e19bcba6a1737160bb5
record_format	dspace
spelling	oai:doaj.org-article:9d8ed2283b7f4e19bcba6a1737160bb52021-12-02T16:06:51ZTuning the Fermi velocity in Dirac materials with an electric field10.1038/s41598-017-08188-32045-2322https://doaj.org/article/9d8ed2283b7f4e19bcba6a1737160bb52017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08188-3https://doaj.org/toc/2045-2322Abstract Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene and topological insulators. Band-engineering techniques should aim to a full control of the parameter that characterizes the Dirac cones: the Fermi velocity. We propose a general mechanism that enables the fine-tuning of the Fermi velocity in Dirac materials in a readily accessible way for experiments. By embedding the sample in a uniform electric field, the Fermi velocity is substantially modified. We first prove this result analytically, for the surface states of a topological insulator/semiconductor interface, and postulate its universality in other Dirac materials. Then we check its correctness in carbon-based Dirac materials, namely graphene nanoribbons and nanotubes, thus showing the validity of our hypothesis in different Dirac systems by means of continuum, tight-binding and ab-initio calculations.A. Díaz-FernándezLeonor ChicoJ. W. GonzálezF. Domínguez-AdameNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. Díaz-Fernández Leonor Chico J. W. González F. Domínguez-Adame Tuning the Fermi velocity in Dirac materials with an electric field
description	Abstract Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene and topological insulators. Band-engineering techniques should aim to a full control of the parameter that characterizes the Dirac cones: the Fermi velocity. We propose a general mechanism that enables the fine-tuning of the Fermi velocity in Dirac materials in a readily accessible way for experiments. By embedding the sample in a uniform electric field, the Fermi velocity is substantially modified. We first prove this result analytically, for the surface states of a topological insulator/semiconductor interface, and postulate its universality in other Dirac materials. Then we check its correctness in carbon-based Dirac materials, namely graphene nanoribbons and nanotubes, thus showing the validity of our hypothesis in different Dirac systems by means of continuum, tight-binding and ab-initio calculations.
format	article
author	A. Díaz-Fernández Leonor Chico J. W. González F. Domínguez-Adame
author_facet	A. Díaz-Fernández Leonor Chico J. W. González F. Domínguez-Adame
author_sort	A. Díaz-Fernández
title	Tuning the Fermi velocity in Dirac materials with an electric field
title_short	Tuning the Fermi velocity in Dirac materials with an electric field
title_full	Tuning the Fermi velocity in Dirac materials with an electric field
title_fullStr	Tuning the Fermi velocity in Dirac materials with an electric field
title_full_unstemmed	Tuning the Fermi velocity in Dirac materials with an electric field
title_sort	tuning the fermi velocity in dirac materials with an electric field
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9d8ed2283b7f4e19bcba6a1737160bb5
work_keys_str_mv	AT adiazfernandez tuningthefermivelocityindiracmaterialswithanelectricfield AT leonorchico tuningthefermivelocityindiracmaterialswithanelectricfield AT jwgonzalez tuningthefermivelocityindiracmaterialswithanelectricfield AT fdominguezadame tuningthefermivelocityindiracmaterialswithanelectricfield
_version_	1718384858444595200

Tuning the Fermi velocity in Dirac materials with an electric field

Ejemplares similares