The DOI matches its Crossref record; 27 of the 27 references it cites were found in a registry or an index.
Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
Open accessAbstract
We report systematic optical studies of WS2 and WSe2 monolayers and multilayers. The efficiency of second harmonic generation shows a dramatic even-odd oscillation with the number of layers, consistent with the presence (absence) of inversion symmetry in even-layer (odd-layer). Photoluminescence (PL) measurements show the crossover from an indirect band gap semiconductor at multilayers to a direct-gap one at monolayers. A hot luminescence peak (B) is observed at ~0.4 eV above the prominent band edge peak (A) in all samples. The magnitude of A-B splitting is independent of the number of layers and coincides with the spin-valley coupling strength in monolayers. Ab initio calculations show that this thickness independent splitting pattern is a direct consequence of the giant spin-valley coupling which fully suppresses interlayer hopping at valence band edge near K points because of the sign change of the spin-valley coupling from layer to layer in the 2H stacking order.
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Metadata
- Authors
- Zeng, H., Liu, G.-B., Dai, J., Yan, Y., Zhu, B., He, R., Xie, L., Xu, S., Chen, X., Yao, W., & Cui, X.
- Venue
- Scientific Reports
- Published
- 2013-04-11
- Volume
- 3
- Issue
- 1
- Pages
- 1608-1608
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2027012071
- Cited by
- 1,064
- References
- 27
- FWCI
- 32.41
- Type
- journal article
- Language
- en
- Open access
- gold
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