Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films

Abstract Nickel ditelluride (NiTe2), a recently discovered Type-II Dirac semimetal with topological Dirac fermions near the Fermi energy, is expected to exhibit strong thickness-mediated electronic tunability and intrinsic two-gap superconductivity in the single-layer limit. Realizing such intriguin...

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Autores principales:	Joseph A. Hlevyack, Liang-Ying Feng, Meng-Kai Lin, Rovi Angelo B. Villaos, Ro-Ya Liu, Peng Chen, Yao Li, Sung-Kwan Mo, Feng-Chuan Chuang, T.-C. Chiang
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/a33d759ddcb541d7a5ed2c76bdb71aab
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spelling	oai:doaj.org-article:a33d759ddcb541d7a5ed2c76bdb71aab2021-12-02T18:02:55ZDimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films10.1038/s41699-021-00218-z2397-7132https://doaj.org/article/a33d759ddcb541d7a5ed2c76bdb71aab2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41699-021-00218-zhttps://doaj.org/toc/2397-7132Abstract Nickel ditelluride (NiTe2), a recently discovered Type-II Dirac semimetal with topological Dirac fermions near the Fermi energy, is expected to exhibit strong thickness-mediated electronic tunability and intrinsic two-gap superconductivity in the single-layer limit. Realizing such intriguing phenomena requires the fabrication of ultrathin NiTe2 films and an understanding of the underlying physics that is still under debate. By conducting experimental band mappings of ultrathin films prepared with molecular beam epitaxy, we reveal spectroscopic evidence for the dimensionality crossover of single-crystalline ultrathin NiTe2 films as a function of film thickness. As the film thickness increases from one to five layers, the gap in the conical topological surface states closes. Comparisons of experimental to first-principles results also highlight difficulties in fabricating atomically smooth single-layer NiTe2 films. Our results not only provide further impetus for studying emergent phenomena in NiTe2 but also underscore the limitations of fabricating NiTe2 films for device applications.Joseph A. HlevyackLiang-Ying FengMeng-Kai LinRovi Angelo B. VillaosRo-Ya LiuPeng ChenYao LiSung-Kwan MoFeng-Chuan ChuangT.-C. ChiangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-9 (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 Joseph A. Hlevyack Liang-Ying Feng Meng-Kai Lin Rovi Angelo B. Villaos Ro-Ya Liu Peng Chen Yao Li Sung-Kwan Mo Feng-Chuan Chuang T.-C. Chiang Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
description	Abstract Nickel ditelluride (NiTe2), a recently discovered Type-II Dirac semimetal with topological Dirac fermions near the Fermi energy, is expected to exhibit strong thickness-mediated electronic tunability and intrinsic two-gap superconductivity in the single-layer limit. Realizing such intriguing phenomena requires the fabrication of ultrathin NiTe2 films and an understanding of the underlying physics that is still under debate. By conducting experimental band mappings of ultrathin films prepared with molecular beam epitaxy, we reveal spectroscopic evidence for the dimensionality crossover of single-crystalline ultrathin NiTe2 films as a function of film thickness. As the film thickness increases from one to five layers, the gap in the conical topological surface states closes. Comparisons of experimental to first-principles results also highlight difficulties in fabricating atomically smooth single-layer NiTe2 films. Our results not only provide further impetus for studying emergent phenomena in NiTe2 but also underscore the limitations of fabricating NiTe2 films for device applications.
format	article
author	Joseph A. Hlevyack Liang-Ying Feng Meng-Kai Lin Rovi Angelo B. Villaos Ro-Ya Liu Peng Chen Yao Li Sung-Kwan Mo Feng-Chuan Chuang T.-C. Chiang
author_facet	Joseph A. Hlevyack Liang-Ying Feng Meng-Kai Lin Rovi Angelo B. Villaos Ro-Ya Liu Peng Chen Yao Li Sung-Kwan Mo Feng-Chuan Chuang T.-C. Chiang
author_sort	Joseph A. Hlevyack
title	Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
title_short	Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
title_full	Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
title_fullStr	Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
title_full_unstemmed	Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films
title_sort	dimensional crossover and band topology evolution in ultrathin semimetallic nite2 films
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a33d759ddcb541d7a5ed2c76bdb71aab
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Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films

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