Journal
ADVANCED SCIENCE
Volume 6, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900446
Keywords
2D transition metal dichalcogenides; electronic correlations; excitons; heterointerfaces; perovskite oxides
Categories
Funding
- National Natural Science Foundation of China [51472164]
- 1000 Talents Program for Young Scientists of China, Shenzhen Peacock Plan [KQTD2016053112042971]
- Educational Commission of Guangdong Province [2015KGJHZ006, 2016KCXTD006]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- China Postdoctoral Science Foundation [2016M600664]
- Natural Science Foundation of SZU [000050]
- Singapore National Research Foundation under its Competitive Research Funding [NRF-CRP 8-2011-06]
- MOE-AcRF Tier-2 [MOE2015-T2-1-099]
- 2015 PHC Merlion Project
- FRCs
- Singapore A*STAR 2D Pharos project: 2D devices & materials for ubiquitous electronic, sensor and optoelectronic applications [SERC-1527000012]
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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.
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