Cargando…

Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films

The Weyl semimetal WTe(2) and MoTe(2) show great potential in generating large spin currents since they possess topologically protected spin‐polarized states and can carry a very large current density. In addition, the intrinsic non‐centrosymmetry of WTe(2) and MoTe(2) endows with a unique property...

Descripción completa

Detalles Bibliográficos
Autores principales: Wang, Qisheng, Li, Jie, Besbas, Jean, Hsu, Chuang‐Han, Cai, Kaiming, Yang, Li, Cheng, Shuai, Wu, Yang, Zhang, Wenfeng, Wang, Kaiyou, Chang, Tay‐Rong, Lin, Hsin, Chang, Haixin, Yang, Hyunsoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010885/
https://www.ncbi.nlm.nih.gov/pubmed/29938171
http://dx.doi.org/10.1002/advs.201700912
_version_ 1783333683969654784
author Wang, Qisheng
Li, Jie
Besbas, Jean
Hsu, Chuang‐Han
Cai, Kaiming
Yang, Li
Cheng, Shuai
Wu, Yang
Zhang, Wenfeng
Wang, Kaiyou
Chang, Tay‐Rong
Lin, Hsin
Chang, Haixin
Yang, Hyunsoo
author_facet Wang, Qisheng
Li, Jie
Besbas, Jean
Hsu, Chuang‐Han
Cai, Kaiming
Yang, Li
Cheng, Shuai
Wu, Yang
Zhang, Wenfeng
Wang, Kaiyou
Chang, Tay‐Rong
Lin, Hsin
Chang, Haixin
Yang, Hyunsoo
author_sort Wang, Qisheng
collection PubMed
description The Weyl semimetal WTe(2) and MoTe(2) show great potential in generating large spin currents since they possess topologically protected spin‐polarized states and can carry a very large current density. In addition, the intrinsic non‐centrosymmetry of WTe(2) and MoTe(2) endows with a unique property of crystal symmetry‐controlled spin–orbit torques. An important question to be answered for developing spintronic devices is how spins relax in WTe(2) and MoTe(2). Here, a room‐temperature spin relaxation time of 1.2 ns (0.4 ns) in WTe(2) (MoTe(2)) thin film using the time‐resolved Kerr rotation (TRKR) is reported. Based on ab initio calculation, a mechanism of long‐lived spin polarization resulting from a large spin splitting around the bottom of the conduction band, low electron–hole recombination rate, and suppression of backscattering required by time‐reversal and lattice symmetry operation is identified. In addition, it is found that the spin polarization is firmly pinned along the strong internal out‐of‐plane magnetic field induced by large spin splitting. This work provides an insight into the physical origin of long‐lived spin polarization in Weyl semimetals, which could be useful to manipulate spins for a long time at room temperature.
format Online
Article
Text
id pubmed-6010885
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-60108852018-06-22 Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films Wang, Qisheng Li, Jie Besbas, Jean Hsu, Chuang‐Han Cai, Kaiming Yang, Li Cheng, Shuai Wu, Yang Zhang, Wenfeng Wang, Kaiyou Chang, Tay‐Rong Lin, Hsin Chang, Haixin Yang, Hyunsoo Adv Sci (Weinh) Communications The Weyl semimetal WTe(2) and MoTe(2) show great potential in generating large spin currents since they possess topologically protected spin‐polarized states and can carry a very large current density. In addition, the intrinsic non‐centrosymmetry of WTe(2) and MoTe(2) endows with a unique property of crystal symmetry‐controlled spin–orbit torques. An important question to be answered for developing spintronic devices is how spins relax in WTe(2) and MoTe(2). Here, a room‐temperature spin relaxation time of 1.2 ns (0.4 ns) in WTe(2) (MoTe(2)) thin film using the time‐resolved Kerr rotation (TRKR) is reported. Based on ab initio calculation, a mechanism of long‐lived spin polarization resulting from a large spin splitting around the bottom of the conduction band, low electron–hole recombination rate, and suppression of backscattering required by time‐reversal and lattice symmetry operation is identified. In addition, it is found that the spin polarization is firmly pinned along the strong internal out‐of‐plane magnetic field induced by large spin splitting. This work provides an insight into the physical origin of long‐lived spin polarization in Weyl semimetals, which could be useful to manipulate spins for a long time at room temperature. John Wiley and Sons Inc. 2018-04-14 /pmc/articles/PMC6010885/ /pubmed/29938171 http://dx.doi.org/10.1002/advs.201700912 Text en © 2018 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Communications
Wang, Qisheng
Li, Jie
Besbas, Jean
Hsu, Chuang‐Han
Cai, Kaiming
Yang, Li
Cheng, Shuai
Wu, Yang
Zhang, Wenfeng
Wang, Kaiyou
Chang, Tay‐Rong
Lin, Hsin
Chang, Haixin
Yang, Hyunsoo
Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title_full Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title_fullStr Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title_full_unstemmed Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title_short Room‐Temperature Nanoseconds Spin Relaxation in WTe(2) and MoTe(2) Thin Films
title_sort room‐temperature nanoseconds spin relaxation in wte(2) and mote(2) thin films
topic Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010885/
https://www.ncbi.nlm.nih.gov/pubmed/29938171
http://dx.doi.org/10.1002/advs.201700912
work_keys_str_mv AT wangqisheng roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT lijie roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT besbasjean roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT hsuchuanghan roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT caikaiming roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT yangli roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT chengshuai roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT wuyang roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT zhangwenfeng roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT wangkaiyou roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT changtayrong roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT linhsin roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT changhaixin roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms
AT yanghyunsoo roomtemperaturenanosecondsspinrelaxationinwte2andmote2thinfilms