Samuel Beaulieu, Jakub Schusser, Shuo Dong, Tommaso Pincelli, Maciej Dendzik, Julian Maklar, Alexander Neef, Hubert Ebert, Karol Hricovini, Martin Wolf, Jürgen Braun, Laurenz Rettig, Jan Minár, and Ralph Ernstorfer
? ( ), (2020), pp. ;
arXiv:2006.01657 [cond-mat.mtrl-sci] (2020), pp. 12;
DOI: arXiv:2006.01657 [cond-mat.mtrl-sci]
We performed angle-resolved photoemission spectroscopy (ARPES) of bulk 2H-WSe2 for different crystal orientations linked to each other by time-reversal symmetry. We introduce a new observable called time-reversal dichroism, which quantifies the modulation of the photoemission intensity upon effective time-reversal operation. We demonstrate that the hidden orbital-texture of the crystal's electronic structure leaves its imprint onto the time-reversal dichroism, due to multiple orbitals interference effects in photoemission. Our experimental results are in quantitative agreement with 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 demonstrate that time-reversal dichroism is sensitive to its orbital-texture counterpart.
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