非对称空间群系统RAlSi(R:Ce和Nd)中光电子强度分布的能带选区效应
Zone-selection effect of photoelectron intensity distributions in a nonsymmorphic system RAlSi (R : Ce and Nd)
AI总结:
本研究通过软X射线角分辨光电子能谱研究非中心对称外尔半金属RAlSi,发现非对称空间群导致的能带选区效应影响光电子强度分布,并成功在三维动量空间中追踪外尔锥色散。
摘要:
我们利用软X射线角分辨光电子能谱研究了非中心对称外尔半金属RAlSi(R:Ce和Nd)的电子结构。我们发现,由于RAlSi的非对称空间群晶体结构引起的能带选区效应,在动量分辨电子能带中观察到的光电子强度分布对覆盖的布里渊区(BZ)高度敏感。我们的数据重构了根据能带选区效应变化的光电子分布,并揭示了由能带计算再现的电子能带结构的全面信息。这些详细信息使我们能够在三维动量空间中实验追踪外尔锥色散,为理解RAlSi的独特性质提供了宝贵见解。
英文摘要:
We investigate the electronic structures of noncentrosymmetric Weyl semimetals RAlSi (R: Ce and Nd) using soft x-ray angle-resolved photoemission spectroscopy. We find that the photoelectron intensity distribution observed in the momentum-resolved electronic bands is highly sensitive to the covered Brillouin zone (BZ) due to the zone-selection effect arising from the nonsymmorphic crystal structure of RAlSi. Our data reconstruct the photoelectron distributions varied according to the zone-selection effect, and reveal comprehensive information about the electronic band structures reproduced by band calculations. This detailed information enables us to experimentally trace the Weyl-cone dispersion throughout three-dimensional momentum space, providing valuable insights into the unique properties of RAlSi.
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