Modulation of New Excitons in Transition Metal Dichalcogenide-Perovskite Oxide System

Xinmao Yin, Ming Yang, Chi Sin Tang, Qixing Wang, Lei Xu, Jing Wu, Paolo Emilio Trevisanutto, Shengwei Zeng, Xin Yu Chin, Teguh Citra Asmara, Yuan Ping Feng, Ariando Ariando, Manish Chhowalla, Shi Jie Wang, Wenjing Zhang, Andrivo Rusydi, Andrew T.S. Wee

Research output: Contribution to journalArticle

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 languageEnglish
Article number1900446
JournalAdvanced Science
Volume6
Issue number12
DOIs
Publication statusPublished - Jun 19 2019

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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)

Cite this

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]. https://doi.org/10.1002/advs.201900446