We performed angle-resolved photoemission spectroscopy (ARPES) of bulk 2H-${\mathrm{WSe}}_2$ for different crystal orientations linked to each other by time-reversal symmetry. We introduce a new observable called time-reversal dichroism in photoelectron angular distributions (TRDAD), which quantifies the modulation of the photoemission intensity upon effective time-reversal operation. We demonstrate that the hidden orbital pseudospin texture leaves its imprint on TRDAD, due to multiple orbital interference effects in photoemission. Our experimental results are in quantitative agreement with both the tight-binding model and state-of-the-art fully relativistic calculations performed using the one-step model of photoemission. While spin-resolved ARPES probes the spin component of entangled spin-orbital texture in multiorbital systems, we unambiguously demonstrate that TRDAD reveals its orbital pseudospin texture counterpart.

中文翻译：

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在光电子角分布中通过时间二向色性揭示隐藏的轨道伪旋转纹理

我们进行了大体积2H-的角度分辨光发射光谱（ARPES）${\mathrm{硒化钨}}_2$对于不同的晶体取向，通过时间反转对称性彼此关联。我们在光电子角分布（TRDAD）中引入了一种新的可观察到的称为时间反转二向色性（TRDAD），它可以在有效的时间反转操作中量化光发射强度的调制。我们证明了隐藏的伪轨道自旋纹理在TRDAD上留下了印记，这是由于光发射中存在多个轨道干涉效应。我们的实验结果与紧密结合模型和使用光发射的一步模型进行的最先进的完全相对论计算都在定量上吻合。尽管自旋分辨的ARPES探测了多轨道系统中纠缠自旋轨道纹理的自旋分量，但我们清楚地证明了TRDAD揭示了其轨道伪自旋纹理的对应物。