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Title: Modulation of New Excitons in Transition Metal Dichalcogenide-Perovskite Oxide System
Authors: Yin, X. 
Yang, M.
Tang, C.S. 
Wang, Q. 
Xu, L.
Wu, J.
Trevisanutto, P.E. 
Zeng, S. 
Chin, X.Y.
Asmara, T.C. 
Feng, Y.P. 
Ariando, A. 
Chhowalla, M.
Wang, S.J. 
Zhang, W.
Rusydi, A. 
Wee, A.T.S. 
Keywords: 2D transition metal dichalcogenides
electronic correlations
perovskite oxides
Issue Date: 2019
Publisher: John Wiley and Sons Inc.
Citation: Yin, X., Yang, M., Tang, C.S., Wang, Q., Xu, L., Wu, J., Trevisanutto, P.E., Zeng, S., Chin, X.Y., Asmara, T.C., Feng, Y.P., Ariando, A., Chhowalla, M., Wang, S.J., Zhang, W., Rusydi, A., Wee, A.T.S. (2019). Modulation of New Excitons in Transition Metal Dichalcogenide-Perovskite Oxide System. Advanced Science 6 (12) : 1900446. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The exciton, a quasi-particle that creates a bound state of an electron and a hole, is typically found in semiconductors. It has attracted major attention in the context of both fundamental science and practical applications. Transition metal dichalcogenides (TMDs) are a new class of 2D materials that include direct band-gap semiconductors with strong spin–orbit coupling and many-body interactions. Manipulating new excitons in semiconducting TMDs could generate a novel means of application in nanodevices. Here, the observation of high-energy excitonic peaks in the monolayer-MoS2 on a SrTiO3 heterointerface generated by a new complex mechanism is reported, based on a comprehensive study that comprises temperature-dependent optical spectroscopies and first-principles calculations. The appearance of these excitons is attributed to the change in many-body interactions that occurs alongside the interfacial orbital hybridization and spin–orbit coupling brought about by the excitonic effect propagated from the substrate. This has further led to the formation of a Fermi-surface feature at the interface. The results provide an atomic-scale understanding of the heterointerface between monolayer-TMDs and perovskite oxide and highlight the importance of spin–orbit–charge–lattice coupling on the intrinsic properties of atomic-layer heterostructures, which open up a way to manipulate the excitonic effects in monolayer TMDs via an interfacial system. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Source Title: Advanced Science
ISSN: 2198-3844
DOI: 10.1002/advs.201900446
Rights: Attribution 4.0 International
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