Spin polarization detection via chirality-induced tunnelling currents in indium selenide

IF 37.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Gabriele Pasquale, Paulo E. Faria Junior, Shun Feng, Eloi Collette, Kenji Watanabe, Takashi Taniguchi, Jaroslav Fabian, Andras Kis
{"title":"Spin polarization detection via chirality-induced tunnelling currents in indium selenide","authors":"Gabriele Pasquale, Paulo E. Faria Junior, Shun Feng, Eloi Collette, Kenji Watanabe, Takashi Taniguchi, Jaroslav Fabian, Andras Kis","doi":"10.1038/s41563-024-02067-9","DOIUrl":null,"url":null,"abstract":"Chirality, a basic property of symmetry breaking, is crucial for fields such as biology and physics. Recent advances in the study of chiral systems have stimulated interest in the discovery of symmetry-breaking states that enable exotic phenomena such as spontaneous gyrotropic order and superconductivity. Here we examine the interaction between light chirality and electron spins in indium selenide and study the effect of magnetic field on emerging tunnelling photocurrents at the Van Hove singularity. Although the effect is symmetric under linearly polarized light excitation, a non-symmetric signal emerges when the excitation is circularly polarized, making it possible to electrically detect light’s chirality. Our study shows a negligible out-of-plane g-factor for few-layer indium selenide at the valence band edge, resulting in an unbalanced Zeeman splitting in hexagonal boron nitride spin bands. This finding allows us to measure the change in energy barrier height with exceptional resolution (~15 μeV). Furthermore, we confirm the long-standing theoretical prediction of spin-polarized hole accumulation in the flat valence band at increasing laser powers. Light chirality and electron spin interactions and the dependence of tunnelling photocurrent on the magnetic field are studied in indium selenide, exploiting its non-symmetric response to circularly polarized light to electrically detect chirality.","PeriodicalId":19058,"journal":{"name":"Nature Materials","volume":"24 2","pages":"212-218"},"PeriodicalIF":37.2000,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41563-024-02067-9.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature Materials","FirstCategoryId":"88","ListUrlMain":"https://www.nature.com/articles/s41563-024-02067-9","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Chirality, a basic property of symmetry breaking, is crucial for fields such as biology and physics. Recent advances in the study of chiral systems have stimulated interest in the discovery of symmetry-breaking states that enable exotic phenomena such as spontaneous gyrotropic order and superconductivity. Here we examine the interaction between light chirality and electron spins in indium selenide and study the effect of magnetic field on emerging tunnelling photocurrents at the Van Hove singularity. Although the effect is symmetric under linearly polarized light excitation, a non-symmetric signal emerges when the excitation is circularly polarized, making it possible to electrically detect light’s chirality. Our study shows a negligible out-of-plane g-factor for few-layer indium selenide at the valence band edge, resulting in an unbalanced Zeeman splitting in hexagonal boron nitride spin bands. This finding allows us to measure the change in energy barrier height with exceptional resolution (~15 μeV). Furthermore, we confirm the long-standing theoretical prediction of spin-polarized hole accumulation in the flat valence band at increasing laser powers. Light chirality and electron spin interactions and the dependence of tunnelling photocurrent on the magnetic field are studied in indium selenide, exploiting its non-symmetric response to circularly polarized light to electrically detect chirality.

Abstract Image

Abstract Image

手性诱导隧穿电流检测硒化铟的自旋极化
手性是对称破缺的基本性质,对生物学和物理学等领域至关重要。手性体系研究的最新进展激发了人们对发现对称破缺态的兴趣,对称破缺态可以实现诸如自发回旋有序和超导等奇异现象。本文研究了硒化铟中光手性与电子自旋之间的相互作用,并研究了磁场对Van Hove奇点处出现的隧穿光电流的影响。虽然这种效应在线偏振光激发下是对称的,但当激发为圆偏振光时,会出现非对称信号,这使得电检测光的手性成为可能。我们的研究表明,在价带边缘的几层硒化铟的面外g因子可以忽略不计,导致六方氮化硼自旋带中不平衡的塞曼分裂。这一发现使我们能够以优异的分辨率(~15 μeV)测量能量势垒高度的变化。此外,我们证实了长期以来的理论预测,即在增加激光功率的情况下,自旋极化空穴在平价带积累。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Nature Materials
Nature Materials 工程技术-材料科学:综合
CiteScore
62.20
自引率
0.70%
发文量
221
审稿时长
3.2 months
期刊介绍: Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信