Electronic structure, spin-orbit coupling, and interlayer interaction in bulk MoS 2 and WS 2

Here, we present in-depth measurements of the electronic band structure of the transition-metal dichalcogenides (TMDs) MoS2 and WS2 using angle-resolved photoemission spectroscopy, with focus on the energy splittings in their valence bands at the K point of the Brillouin zone. Experimental results a...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-06, Vol.91 (23)
Main Authors: Latzke, Drew W., Zhang, Wentao, Suslu, Aslihan, Chang, Tay-Rong, Lin, Hsin, Jeng, Horng-Tay, Tongay, Sefaattin, Wu, Junqiao, Bansil, Arun, Lanzara, Alessandra
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
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Summary:Here, we present in-depth measurements of the electronic band structure of the transition-metal dichalcogenides (TMDs) MoS2 and WS2 using angle-resolved photoemission spectroscopy, with focus on the energy splittings in their valence bands at the K point of the Brillouin zone. Experimental results are interpreted in terms of our parallel first-principles computations. We find that interlayer interaction only weakly contributes to the splitting in bulk WS2, resolving previous debates on its relative strength. We additionally find that across a range of TMDs, the band gap generally decreases with increasing magnitude of the valence-band splitting, molecular mass, or ratio of the out-of-plane to in-plane lattice constant. Our findings offer an important reference for future studies of electronic properties of MoS2 and WS2 and their applications in spintronics and valleytronics devices.
ISSN:1098-0121