Electronic structure, spin-orbit coupling, and interlayer interaction in bulk MoS2 and WS2
| Autor: | Latzke, Drew W., Zhang, Wentao, Suslu, Aslihan, Chang, Tay-Rong, Lin, Hsin, Jeng, Horng-Tay, Tongay, Sefaattin, Wu, Junqiao, Bansil, Arun, Lanzara, Alessandra |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 91, 235202 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.91.235202 |
| Popis: | 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 results provide an important reference for future studies of electronic properties of MoS2 and WS2 and their applications in spintronics and valleytronics devices. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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