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.
Original language | English |
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Article number | 1900446 |
Journal | Advanced Science |
Volume | 6 |
Issue number | 12 |
DOIs | |
Publication status | Published - Jun 19 2019 |
Keywords
- 2D transition metal dichalcogenides
- electronic correlations
- excitons
- heterointerfaces
- perovskite oxides
ASJC Scopus subject areas
- Medicine (miscellaneous)
- Chemical Engineering(all)
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- Materials Science(all)
- Engineering(all)
- Physics and Astronomy(all)