Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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  • Author: Choi, Chanyeol

    University of California at Los Angeles, United States

  • Author: Huang, Jiahui

    University of California at Los Angeles, United States

  • Author: Cheng, Hung-Chieh

    University of California at Los Angeles, United States

  • Author: Kim, Hyunseok

    University of California at Los Angeles, United States

  • Author: Vinod, Abhinav Kumar

    University of California at Los Angeles, United States

  • Author: Bae, Sang-Hoon

    University of California at Los Angeles, United States

  • Author: Özçelik, V. Ongun

    Princeton University, United States

  • Author: Grassi, Roberto

    University of Minnesota, United States

  • Author: Chae, Jongjae

    University of California at Los Angeles, United States

  • Author: Huang, Shu-Wei

    University of California at Los Angeles, United States

  • Author: Duan, Xiangfeng

    University of California at Los Angeles, United States

  • Author: Kaasbjerg, Kristen

    Center for Nanostructured Graphene, Centers, Theoretical Nanotechnology, Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, 2800, Kgs. Lyngby, Denmark

  • Author: Low, Tony

    University of Minnesota, United States

  • Author: Wong, Chee Wei

    University of California at Los Angeles, United States

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Vertically stacked van der Waals heterostructures constitute a promising platform for providing tailored band alignment with enhanced excitonic systems.Here we report observations of neutral and charged interlayer excitons in trilayer WSe2-MoSe2-WSe2 van der Waals heterostructures and their dynamics. The addition of a WSe2 layer in the trilayer leads to significantly higher photoluminescence quantum yields and tunable spectral resonance compared to its bilayer heterostructures at cryogenic temperatures. The observed enhancement in the photoluminescence quantum yield is due to significantly larger electron-hole overlap and higher light absorbance in the trilayer heterostructure, supported via first-principle pseudopotential calculations based on spin-polarized density functional theory. We further uncover the temperature- and power-dependence, as well as time-resolved photoluminescence of the trilayer heterostructure interlayer neutral excitons and trions. Our study elucidates the prospects of manipulating light emission from interlayer excitons and designing atomic heterostructures from first-principles for optoelectronics.
Original languageEnglish
Article number30
JournalNpj 2d Materials and Applications
Volume2
Issue number1
Number of pages9
ISSN2397-7132
DOIs
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

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