Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study

Abstract One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-t...

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Autores principales:	I. I. Klimovskikh, A. M. Shikin, M. M. Otrokov, A. Ernst, I. P. Rusinov, O. E. Tereshchenko, V. A. Golyashov, J. Sánchez-Barriga, A. Yu. Varykhalov, O. Rader, K. A. Kokh, E. V. Chulkov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/abf4fcb9e3b74456950d5504b2fb071c
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spelling	oai:doaj.org-article:abf4fcb9e3b74456950d5504b2fb071c2021-12-02T12:30:11ZGiant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study10.1038/s41598-017-03507-02045-2322https://doaj.org/article/abf4fcb9e3b74456950d5504b2fb071c2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03507-0https://doaj.org/toc/2045-2322Abstract One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-trivial superconducting phase, predicted to support zero-energy Majorana fermion modes. Using angle-resolved photoemission spectroscopy and ab initio calculations, we study the 2DEG at the surface of the vanadium-doped polar semiconductor with a giant Rashba-type splitting, BiTeI. We show that the vanadium-induced magnetization in the 2DEG breaks time-reversal symmetry, lifting Kramers degeneracy of the Rashba-split surface state at the Brillouin zone center via formation of a huge gap of about 90 meV. As a result, the constant energy contour inside the gap consists of only one circle with spin-momentum locking. These findings reveal a great potential of the magnetically-doped semiconductors with a giant Rashba-type splitting for realization of novel states of matter.I. I. KlimovskikhA. M. ShikinM. M. OtrokovA. ErnstI. P. RusinovO. E. TereshchenkoV. A. GolyashovJ. Sánchez-BarrigaA. Yu. VarykhalovO. RaderK. A. KokhE. V. ChulkovNature 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 I. I. Klimovskikh A. M. Shikin M. M. Otrokov A. Ernst I. P. Rusinov O. E. Tereshchenko V. A. Golyashov J. Sánchez-Barriga A. Yu. Varykhalov O. Rader K. A. Kokh E. V. Chulkov Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
description	Abstract One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-trivial superconducting phase, predicted to support zero-energy Majorana fermion modes. Using angle-resolved photoemission spectroscopy and ab initio calculations, we study the 2DEG at the surface of the vanadium-doped polar semiconductor with a giant Rashba-type splitting, BiTeI. We show that the vanadium-induced magnetization in the 2DEG breaks time-reversal symmetry, lifting Kramers degeneracy of the Rashba-split surface state at the Brillouin zone center via formation of a huge gap of about 90 meV. As a result, the constant energy contour inside the gap consists of only one circle with spin-momentum locking. These findings reveal a great potential of the magnetically-doped semiconductors with a giant Rashba-type splitting for realization of novel states of matter.
format	article
author	I. I. Klimovskikh A. M. Shikin M. M. Otrokov A. Ernst I. P. Rusinov O. E. Tereshchenko V. A. Golyashov J. Sánchez-Barriga A. Yu. Varykhalov O. Rader K. A. Kokh E. V. Chulkov
author_facet	I. I. Klimovskikh A. M. Shikin M. M. Otrokov A. Ernst I. P. Rusinov O. E. Tereshchenko V. A. Golyashov J. Sánchez-Barriga A. Yu. Varykhalov O. Rader K. A. Kokh E. V. Chulkov
author_sort	I. I. Klimovskikh
title	Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
title_short	Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
title_full	Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
title_fullStr	Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
title_full_unstemmed	Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
title_sort	giant magnetic band gap in the rashba-split surface state of vanadium-doped bitei: a combined photoemission and ab initio study
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/abf4fcb9e3b74456950d5504b2fb071c
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Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study

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