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We performed angle-resolved photoemission spectroscopy (ARPES) of bulk2H-WSe$_2$ for different crystal orientations linked to each other bytime-reversal symmetry. We introduce a new observable called time-reversaldichroism in photoelectron angular distributions (TRDAD), which quantifies themodulation of the photoemission intensity upon effective time-reversaloperation. We demonstrate that the hidden orbital pseudospin texture leaves itsimprint onto TRDAD, due to multiple orbitals interference effects inphotoemission. Our experimental results are in quantitative agreement with bothtight-binding model and state-of-the-art fully relativistic calculationsperformed using the one-step model of photoemission. While spin-resolved ARPESprobes the spin component of entangled spin-orbital texture in multiorbitalsystems, we unambiguously demonstrate that TRDAD reveals its orbital pseudospintexture counterpart.

Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions