The electronic structures of layered rare-earth tritelluride RTe₃ (R = Pr, Er) charge density wave (CDW) compounds have been investigated by performing R 4d → 4f resonant photoemission spectroscopy (RPES) and angle-resolved photoemission spectroscopy (ARPES) measurements for high-quality single crystals. R 4d → 4f RPES measurements reveal that the R 4f states do not contribute directly to the CDW formation in RTe₃ but that the R 4f-Te 5p hybridization in PrTe₃ is significantly larger than that in ErTe₃. In the photon-energy maps for the Fermi-edge (E _F)-crossing states in RTe₃, straight vertical dispersions are observed along k _c , demonstrating the 2D character for the near-E _F states in both R = Pr and Er. This finding implies the weak interlayer interaction between R-Te(1) and Te(2)–Te(3) layers, which is supported by the similar linear dichroism in ARPES for PrTe₃ and ErTe₃. The CDW-induced Fermi surface of PrTe₃ exhibits two-fold symmetric features while that of ErTe₃ exhibits four-fold symmetric features. This finding reveals different CDW distortions in PrTe₃ and ErTe₃, the origin of which is likely to be different ionic sizes of R ions and different R 4f-Te 5p hybridization.

层状稀土碲化物R Te ₃ ( R = Pr, Er) 电荷密度波 (CDW) 化合物的电子结构已通过执行R 4 d → 4 f共振光电子能谱 (RPES) 和角分辨光电子能谱进行了研究。 ARPES) 测量高质量单晶。R 4 d → 4 f RPES 测量表明，R 4 f状态不直接有助于R Te _{3 中}的 CDW 形成，但R 4 f -Te 5 pPrTe _{3 中的}杂交明显大于 ErTe ₃。在光子能量为映射费米边缘（ê _˚F）在-crossing状态ř碲₃，笔直的垂直分散体沿着观察ķ _Ç，表明为所述近二维字符ê _˚F在两种状态- [R = Pr和二. 这一发现意味着R -Te(1) 和 Te(2)-Te(3) 层之间的层间相互作用较弱，这得到了 PrTe ₃和 ErTe ₃ ARPES 中类似线性二色性的支持。CDW 诱导的 PrTe ₃费米面 表现出两倍对称特征，而 ErTe ₃表现出四重对称特征。这一发现揭示了 PrTe ₃和 ErTe _{3 中}不同的 CDW 畸变，其起源可能是不同的R离子离子尺寸和不同的R 4 f -Te 5 p杂化。