Orbital-dependent band renormalization in WT e2 revealed by angle-resolved photoemission spectroscopy

The effect of electronic correlation on WTe2 has been investigated by means of angle-resolved photoemission spectroscopy (ARPES) and band-structure calculation. In the ARPES results, the valence band top with Te 5p character reaches the Fermi level and forms complicated hole pockets around the zone center. In addition, two electron pockets are observed besides the hole pockets. The position of the electron pockets is inconsistent with the prediction of band calculation, suggesting the importance of electronic correlation in WTe2. The present analysis indicates the correlation effect is associated with the excitonic coupling between the W 5d electron and Te 5p hole bands.