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Beaulieu, S; Schusser, J; Dong, S; Schüler, M; Pincelli, T; Dendzik, M; Maklar, J; Neef, A; Ebert, H; Hricovini, K; Wolf, M; Braun, J; Rettig, L; Minár, J; Ernstorfer, R
Physical review letters, 11/2020, Volume: 125, Issue: 21Journal Article
We performed angle-resolved photoemission spectroscopy (ARPES) of bulk 2HWSe2 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.
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