Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3

Abstract Topological insulators have become one of the most prominent research topics in materials science in recent years. Specifically, Bi2Te3 is one of the most promising for technological applications due to its conductive surface states and insulating bulk properties. Herein, we contrast the bu...

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Auteurs principaux:	B. Leedahl, D. W. Boukhvalov, E. Z. Kurmaev, A. Kukharenko, I. S. Zhidkov, N. V. Gavrilov, S. O. Cholakh, P. Huu Le, C. Wei Luo, A. Moewes
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2017
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/7e6b16c0272443e0a4930784d5dd1841
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spelling	oai:doaj.org-article:7e6b16c0272443e0a4930784d5dd18412021-12-02T12:32:14ZBulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te310.1038/s41598-017-06069-32045-2322https://doaj.org/article/7e6b16c0272443e0a4930784d5dd18412017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06069-3https://doaj.org/toc/2045-2322Abstract Topological insulators have become one of the most prominent research topics in materials science in recent years. Specifically, Bi2Te3 is one of the most promising for technological applications due to its conductive surface states and insulating bulk properties. Herein, we contrast the bulk and surface structural environments of dopant ions Cr, Mn, Fe, Co, Ni, and Cu in Bi2Te3 thin films in order to further elucidate this compound. Our measurements show the preferred oxidation state and surrounding crystal environment of each 3d-metal atomic species, and how they are incorporated into Bi2Te3. We show that in each case there is a unique interplay between structural environments, and that it is highly dependant on the dopant atom. Mn impurities in Bi2Te3 purely substitute into Bi sites in a 2+ oxidation state. Cr atoms seem only to reside on the surface and are effectively not able to be absorbed into the bulk. Whereas for Co and Ni, an array of substitutional, interstitial, and metallic configurations occur. Considering the relatively heavy Cu atoms, metallic clusters are highly favourable. The situation with Fe is even more complex, displaying a mix of oxidation states that differ greatly between the surface and bulk environments.B. LeedahlD. W. BoukhvalovE. Z. KurmaevA. KukharenkoI. S. ZhidkovN. V. GavrilovS. O. CholakhP. Huu LeC. Wei LuoA. MoewesNature 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 B. Leedahl D. W. Boukhvalov E. Z. Kurmaev A. Kukharenko I. S. Zhidkov N. V. Gavrilov S. O. Cholakh P. Huu Le C. Wei Luo A. Moewes Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
description	Abstract Topological insulators have become one of the most prominent research topics in materials science in recent years. Specifically, Bi2Te3 is one of the most promising for technological applications due to its conductive surface states and insulating bulk properties. Herein, we contrast the bulk and surface structural environments of dopant ions Cr, Mn, Fe, Co, Ni, and Cu in Bi2Te3 thin films in order to further elucidate this compound. Our measurements show the preferred oxidation state and surrounding crystal environment of each 3d-metal atomic species, and how they are incorporated into Bi2Te3. We show that in each case there is a unique interplay between structural environments, and that it is highly dependant on the dopant atom. Mn impurities in Bi2Te3 purely substitute into Bi sites in a 2+ oxidation state. Cr atoms seem only to reside on the surface and are effectively not able to be absorbed into the bulk. Whereas for Co and Ni, an array of substitutional, interstitial, and metallic configurations occur. Considering the relatively heavy Cu atoms, metallic clusters are highly favourable. The situation with Fe is even more complex, displaying a mix of oxidation states that differ greatly between the surface and bulk environments.
format	article
author	B. Leedahl D. W. Boukhvalov E. Z. Kurmaev A. Kukharenko I. S. Zhidkov N. V. Gavrilov S. O. Cholakh P. Huu Le C. Wei Luo A. Moewes
author_facet	B. Leedahl D. W. Boukhvalov E. Z. Kurmaev A. Kukharenko I. S. Zhidkov N. V. Gavrilov S. O. Cholakh P. Huu Le C. Wei Luo A. Moewes
author_sort	B. Leedahl
title	Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
title_short	Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
title_full	Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
title_fullStr	Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
title_full_unstemmed	Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3
title_sort	bulk vs. surface structure of 3d metal impurities in topological insulator bi2te3
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/7e6b16c0272443e0a4930784d5dd1841
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Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi2Te3

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