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arXiv · 2609.28268

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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Abstract

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.

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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. 2026-09-23. Three-photon photoemission on metallic transition metal dichalcogenide NiTe$_{2}$. https://arxiv.org/abs/2609.28268

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