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<p>NbIrTe<sub>4</sub>, a low-symmetry layered material, exhibits pronounced anisotropic electronic and vibrational properties, making it a compelling platform for anisotropic and topological applications. However, its Raman-active phonon modes remain partially undiscovered, due to selection rule limitations in conventional configurations. In this study, we employ angle-resolved polarization Raman spectroscopy to comprehensively probe both in-plane and out-of-plane phonon modes, enabling the full revelation of all Raman-active modes, including the out-of-plane B<sub>1</sub> and B<sub>2</sub> modes that we observe experimentally. By analyzing polarization-dependent spectra across multiple orientations, we uncover strong anisotropy in phonon behavior and extract Raman tensor components. These findings advance the fundamental understanding of direction-dependent vibrational dynamics in NbIrTe<sub>4</sub> and offer a theoretical foundation for exploring orientation-tunable properties in low-symmetry 2D materials.</p>

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Unveiling in-plane and out-of-plane phonon anisotropy in NbIrTe4 through polarization-resolved Raman spectroscopy

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Ting Wen,
  • Yalan Wang,
  • Shuang Cai,
  • Ziluo Su,
  • Jiaqi Wu,
  • Jiaze Qin,
  • Chenyin Jiao,
  • Zejuan Zhang,
  • Zenghui Wang,
  • Shenghai Pei

摘要

NbIrTe4, a low-symmetry layered material, exhibits pronounced anisotropic electronic and vibrational properties, making it a compelling platform for anisotropic and topological applications. However, its Raman-active phonon modes remain partially undiscovered, due to selection rule limitations in conventional configurations. In this study, we employ angle-resolved polarization Raman spectroscopy to comprehensively probe both in-plane and out-of-plane phonon modes, enabling the full revelation of all Raman-active modes, including the out-of-plane B1 and B2 modes that we observe experimentally. By analyzing polarization-dependent spectra across multiple orientations, we uncover strong anisotropy in phonon behavior and extract Raman tensor components. These findings advance the fundamental understanding of direction-dependent vibrational dynamics in NbIrTe4 and offer a theoretical foundation for exploring orientation-tunable properties in low-symmetry 2D materials.