Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field

Abstract Bilayer graphene (BLG) gapped by a vertical electric field represents a valley-symmetry-protected topological insulating state. Emergence of a new topological zero-energy mode has been proposed in BLG at a boundary between regions of inverted band gaps induced by two oppositely polarized ve...

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Autores principales:	Janghee Lee, Kenji Watanabe, Takashi Taniguchi, Hu-Jong Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9b84e7cfded447d48c7e68c804900621
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spelling	oai:doaj.org-article:9b84e7cfded447d48c7e68c8049006212021-12-02T12:32:13ZRealisation of topological zero-energy mode in bilayer graphene in zero magnetic field10.1038/s41598-017-06902-92045-2322https://doaj.org/article/9b84e7cfded447d48c7e68c8049006212017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06902-9https://doaj.org/toc/2045-2322Abstract Bilayer graphene (BLG) gapped by a vertical electric field represents a valley-symmetry-protected topological insulating state. Emergence of a new topological zero-energy mode has been proposed in BLG at a boundary between regions of inverted band gaps induced by two oppositely polarized vertical electric fields. However, its realisation has been challenged by the enormous difficulty in arranging two pairs of accurately aligned split gates on the top and bottom surfaces of clean BLG. Here we report realisation of the topological zero-energy mode in ballistic BLG, with zero-bias differential conductance close to the ideal value of 4 e 2/h (e is the electron charge and h is Planck’s constant) along a boundary channel between a pair of gate-defined inverted band gaps. This constitutes the bona fide electrical-gate-tuned generation of a valley-symmetry-protected topological boundary conducting channel in BLG in zero magnetic field, which is essential to valleytronics applications of BLG.Janghee LeeKenji WatanabeTakashi TaniguchiHu-Jong LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-6 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Janghee Lee Kenji Watanabe Takashi Taniguchi Hu-Jong Lee Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
description	Abstract Bilayer graphene (BLG) gapped by a vertical electric field represents a valley-symmetry-protected topological insulating state. Emergence of a new topological zero-energy mode has been proposed in BLG at a boundary between regions of inverted band gaps induced by two oppositely polarized vertical electric fields. However, its realisation has been challenged by the enormous difficulty in arranging two pairs of accurately aligned split gates on the top and bottom surfaces of clean BLG. Here we report realisation of the topological zero-energy mode in ballistic BLG, with zero-bias differential conductance close to the ideal value of 4 e 2/h (e is the electron charge and h is Planck’s constant) along a boundary channel between a pair of gate-defined inverted band gaps. This constitutes the bona fide electrical-gate-tuned generation of a valley-symmetry-protected topological boundary conducting channel in BLG in zero magnetic field, which is essential to valleytronics applications of BLG.
format	article
author	Janghee Lee Kenji Watanabe Takashi Taniguchi Hu-Jong Lee
author_facet	Janghee Lee Kenji Watanabe Takashi Taniguchi Hu-Jong Lee
author_sort	Janghee Lee
title	Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
title_short	Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
title_full	Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
title_fullStr	Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
title_full_unstemmed	Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
title_sort	realisation of topological zero-energy mode in bilayer graphene in zero magnetic field
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9b84e7cfded447d48c7e68c804900621
work_keys_str_mv	AT jangheelee realisationoftopologicalzeroenergymodeinbilayergrapheneinzeromagneticfield AT kenjiwatanabe realisationoftopologicalzeroenergymodeinbilayergrapheneinzeromagneticfield AT takashitaniguchi realisationoftopologicalzeroenergymodeinbilayergrapheneinzeromagneticfield AT hujonglee realisationoftopologicalzeroenergymodeinbilayergrapheneinzeromagneticfield
_version_	1718394174794891264

Realisation of topological zero-energy mode in bilayer graphene in zero magnetic field

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