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首页> 外文期刊>Optics Letters >Terahertz optical Hall effect in p-type monolayer hexagonal boron nitride on fused silica substrate
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Terahertz optical Hall effect in p-type monolayer hexagonal boron nitride on fused silica substrate

机译：在熔融二氧化硅衬底上的p型单层六边形氮化物中的Terahertz光学霍尔效应

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摘要

We demonstrate for the first time, to the best of our knowledge, that the optical Hall effect (OHE) can be observed in p-type monolayer (ML) hexagonal boron nitride (hBN) on a fused silica substrate by applying linearly polarized tera-hertz (THz) irradiation. When ML hBN is placed on fused silica, in which the incident pulsed THz field can create local and transient electromagnetic dipoles, proximity-induced interactions can be presented. The Rashba spin-orbit coupling can be enhanced, and the in-plane spin component can be induced, along with the lifting of valley degeneracy. Thus, in the presence of linearly polarized THz radiation, the nonzero transverse optical conductivity (or Hall conductivity) can be observed. We measure the THz transmission through ML hBN/fused silica in the temperature range from 80 to 280 K by using THz time-domain spectroscopy in combination with an optical polarization examination. The Faraday ellipticity and rotation angle, together with the complex longitudinal and transverse conductivities, are obtained. The temperature dependence of these quantities is examined. The results obtained from this work indicate that ML hBN is a valleytronic material, and proximity-induced interactions can lead to the observation of OHE in the absence of an external magnetic field. (C) 2021 Optical Society of America
机译：我们首次证明，根据我们所知，通过应用线偏振太赫兹（THz）辐照，可以在熔融石英衬底上的p型单层（ML）六角氮化硼（hBN）中观察到光学霍尔效应（OHE）。当ML hBN放置在熔融石英上时，入射的脉冲太赫兹场可以产生局部和瞬态电磁偶极子，可以呈现接近诱导的相互作用。随着谷简并度的提高，拉什巴自旋轨道耦合增强，面内自旋分量被诱导。因此，在存在线偏振太赫兹辐射的情况下，可以观察到非零横向光学电导率（或霍尔电导率）。在80～280k的温度范围内，利用太赫兹时域光谱结合光学偏振检测，测量了ML-hBN/熔融石英的太赫兹透过率。得到了法拉第椭圆率和旋转角，以及复杂的纵向和横向电导率。研究了这些量的温度依赖性。从这项工作中获得的结果表明，ML hBN是一种价电子材料，在没有外部磁场的情况下，邻近诱导的相互作用可以导致OHE的观察。（2021）美国光学学会

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  • 来源
    《Optics Letters》 |2021年第9期|共4页
  • 作者

    Bilal Muhammad; Xu Wen; Wen Hua; Cheng Xingjia; Xiao Yiming; Ding Lan;

  • 作者单位

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys HFIPS Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys HFIPS Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys HFIPS Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys HFIPS Hefei 230031 Peoples R China;

    Yunnan Univ Sch Phys &

    Astron Kunming 650091 Yunnan Peoples R China;

    Yunnan Univ Sch Phys &

    Astron Kunming 650091 Yunnan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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