$Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}$
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Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}

Evidence for the quantum spin Hall effect (QSHE) has been reported in several experimental systems, in the form of edge conductance approaching a quantized value at zero magnetic field. However, another fundamental feature of the QSHE, that of spin-momentum locking in the edge channel, has not been...

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Autores principales:	Wenjin Zhao, Elliott Runburg, Zaiyao Fei, Joshua Mutch, Paul Malinowski, Bosong Sun, Xiong Huang, Dmytro Pesin, Yong-Tao Cui, Xiaodong Xu, Jiun-Haw Chu, David H. Cobden
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/1d4d2ae7d0a942c3b4e57a3555d1d9f4
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spelling	oai:doaj.org-article:1d4d2ae7d0a942c3b4e57a3555d1d9f42021-11-17T15:20:41ZDetermination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}10.1103/PhysRevX.11.0410342160-3308https://doaj.org/article/1d4d2ae7d0a942c3b4e57a3555d1d9f42021-11-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.041034http://doi.org/10.1103/PhysRevX.11.041034https://doaj.org/toc/2160-3308Evidence for the quantum spin Hall effect (QSHE) has been reported in several experimental systems, in the form of edge conductance approaching a quantized value at zero magnetic field. However, another fundamental feature of the QSHE, that of spin-momentum locking in the edge channel, has not been demonstrated. Here, we report that in an applied magnetic field the edge conductance in monolayer WTe_{2}, a candidate QSHE material, is suppressed by the component of the field perpendicular to a particular axis, implying that the spin in the edge states lies along this axis. Surprisingly, the axis is independent of edge orientation, chemical potential, and sample, being fixed relative to the monolayer crystal structure, lying at (40±2)° to the layer normal within the mirror plane. This finding is consistent with a theoretical model in which the bulk bands nearest the Fermi energy have the same parity, leading to simple spin texture with a single, momentum-independent spin axis that is inherited by the edge modes. In addition, the results strengthen the case for spin-momentum locking and, therefore, that monolayer WTe_{2} is a natural two-dimensional topological insulator exhibiting the QSHE.Wenjin ZhaoElliott RunburgZaiyao FeiJoshua MutchPaul MalinowskiBosong SunXiong HuangDmytro PesinYong-Tao CuiXiaodong XuJiun-Haw ChuDavid H. CobdenAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 4, p 041034 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Wenjin Zhao Elliott Runburg Zaiyao Fei Joshua Mutch Paul Malinowski Bosong Sun Xiong Huang Dmytro Pesin Yong-Tao Cui Xiaodong Xu Jiun-Haw Chu David H. Cobden Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
description	Evidence for the quantum spin Hall effect (QSHE) has been reported in several experimental systems, in the form of edge conductance approaching a quantized value at zero magnetic field. However, another fundamental feature of the QSHE, that of spin-momentum locking in the edge channel, has not been demonstrated. Here, we report that in an applied magnetic field the edge conductance in monolayer WTe_{2}, a candidate QSHE material, is suppressed by the component of the field perpendicular to a particular axis, implying that the spin in the edge states lies along this axis. Surprisingly, the axis is independent of edge orientation, chemical potential, and sample, being fixed relative to the monolayer crystal structure, lying at (40±2)° to the layer normal within the mirror plane. This finding is consistent with a theoretical model in which the bulk bands nearest the Fermi energy have the same parity, leading to simple spin texture with a single, momentum-independent spin axis that is inherited by the edge modes. In addition, the results strengthen the case for spin-momentum locking and, therefore, that monolayer WTe_{2} is a natural two-dimensional topological insulator exhibiting the QSHE.
format	article
author	Wenjin Zhao Elliott Runburg Zaiyao Fei Joshua Mutch Paul Malinowski Bosong Sun Xiong Huang Dmytro Pesin Yong-Tao Cui Xiaodong Xu Jiun-Haw Chu David H. Cobden
author_facet	Wenjin Zhao Elliott Runburg Zaiyao Fei Joshua Mutch Paul Malinowski Bosong Sun Xiong Huang Dmytro Pesin Yong-Tao Cui Xiaodong Xu Jiun-Haw Chu David H. Cobden
author_sort	Wenjin Zhao
title	Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
title_short	Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
title_full	Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
title_fullStr	Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
title_full_unstemmed	Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}
title_sort	determination of the spin axis in quantum spin hall insulator candidate monolayer wte_{2}
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/1d4d2ae7d0a942c3b4e57a3555d1d9f4
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Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe_{2}

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