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arXiv 2609.28268cond-mat.mtrl-sci

金属过渡金属二硫族化合物NiTe$_{2}$上的三光子光电子发射

Three-photon photoemission on metallic transition metal dichalcogenide NiTe$_{2}$

Cheng-Tien Chiang, Mukesh Singh, Yu-Jhen Chuang, Chia-Nung Kuo, Prabesh Bista, Yu-Chan Lin, Chen-Bin Huang, Ming-Chiang Chung, Chin Shan Lue

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中文总结 AI 辅助

首次在金属过渡金属二硫族化合物NiTe$_{2}$上观察到三光子光电子发射,并归因于镜像势共振与未占据体带重叠,为各向异性二维系统相干电子动力学超快研究奠定基础。

中文摘要 AI 辅助

首次在紫外激发下观察到NiTe$_{2}$上的三光子光电子发射(3PPE)信号。在超出双光子激发能量范围内,清晰识别出具有特征光偏振依赖性的能量-动量色散特征。基于其色散、谱宽以及作为平行动量函数的强度,该色散3PPE特征可归因于与电子能带结构相符的、与未占据的Ni $4s$ -Te $4d$/$5p$体带重叠的镜像势共振。我们的结果揭示了金属过渡金属二硫族化合物中的高阶非线性光电子发射,并促进未来对各向异性二维系统中相干电子动力学的超快研究。

英文摘要

Three-photon photoemission (3PPE) signals on NiTe$_{2}$ are observed for the first time upon ultraviolet excitations. In the energy range beyond two-photon excitations, an energy-momentum dispersive feature is clearly identified with characteristic light polarization dependence. Based on its dispersion, spectral width, as well as intensity as a function of the parallel momentum, this dispersive 3PPE feature could be ascribed to an image potential resonance overlapping with an unoccupied Ni $4s$ -Te $4d$/$5p$ bulk band in accordance with the electronic band structure. Our results underlie higher-order non-linear photoemission on metallic transition metal dichalcogenides and facilitate future ultrafast studies of coherent electron dynamics in anisotropic, two-dimensional systems.

发表机构

  • Institute of Atomic and Molecular Sciences, Academia Sinica(原子分子科学研究所,中央研究院)
  • Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica(分子科学与技术项目,台湾国际研究生计划,中央研究院)
  • Department of Physics, National Taiwan University(物理学系,台湾大学)
  • Department of Physics, National Sun Yat-sen University(物理学系,国立中山大学)
  • Department of Physics, National Central University(物理学系,国立中央大学)
  • Department of Physics, Indian Institute of Science Education and Research (IISER) Mohali(物理学系,印度科学教育与研究学院(IISER)莫哈利分校)
  • Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University(创新半导体与可持续制造学院,国立成功大学)
  • Taiwan Consortium of Emergent Crystalline Materials (TCECM), National Science and Technology Council(新兴晶体材料台湾联盟(TCECM),国家科学及技术委员会)

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