Electronic Structure of Decoupled TaS 2 in (SnS) 1.15 (TaS 2 ) Studied by Angle-Resolved Photoemission Spectroscopy

Abstract

We investigate the electronic structure of TaS 2 in the so-called misfit compound (SnS) 1.15 (TaS 2 ) by angle-resolved photoemission spectroscopy. Our results reveal that in contrast to 2H-TaS 2 , TaS 2 layer in (SnS) 1.15 (TaS 2 ) does not exhibit a three-dimensional character: it behaves as a relatively electronically isolated unit with an effective spin–orbit coupling. We find the band shifts near the Fermi level and very weak dispersion along the k[Formula: see text] direction. SnS-derived electronic states below the Fermi level reflect the structural flexibility of the SnS layer, suggesting that an unconventional covalent bonding plays a role in the crystal stability of (SnS) 1.15 (TaS 2 ).