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Stacking angle-tunable photoluminescence from interlayer exciton states in twisted bilayer graphene

Author

Listed:
  • Hiral Patel

    (Oregon State University)

  • Lujie Huang

    (University of Chicago)

  • Cheol-Joo Kim

    (Pohang University of Science and Technology)

  • Jiwoong Park

    (University of Chicago)

  • Matt W. Graham

    (Oregon State University)

Abstract

Twisted bilayer graphene (tBLG) is a metallic material with two degenerate van Hove singularity transitions that can rehybridize to form interlayer exciton states. Here we report photoluminescence (PL) emission from tBLG after resonant 2-photon excitation, which tunes with the interlayer stacking angle, θ. We spatially image individual tBLG domains at room-temperature and show a five-fold resonant PL-enhancement over the background hot-electron emission. Prior theory predicts that interlayer orbitals mix to create 2-photon-accessible strongly-bound (~0.7 eV) exciton and continuum-edge states, which we observe as two spectral peaks in both PL excitation and excited-state absorption spectra. This peak splitting provides independent estimates of the exciton binding energy which scales from 0.5–0.7 eV with θ = 7.5° to 16.5°. A predicted vanishing exciton-continuum coupling strength helps explain both the weak resonant PL and the slower 1 ps−1 exciton relaxation rate observed. This hybrid metal-exciton behavior electron thermalization and PL emission are tunable with stacking angle for potential enhancements in optoelectronic and fast-photosensing graphene-based applications.

Suggested Citation

  • Hiral Patel & Lujie Huang & Cheol-Joo Kim & Jiwoong Park & Matt W. Graham, 2019. "Stacking angle-tunable photoluminescence from interlayer exciton states in twisted bilayer graphene," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09097-x
    DOI: 10.1038/s41467-019-09097-x
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    Cited by:

    1. Qinci Wu & Jun Qian & Yuechen Wang & Luwen Xing & Ziyi Wei & Xin Gao & Yurui Li & Zhongfan Liu & Hongtao Liu & Haowen Shu & Jianbo Yin & Xingjun Wang & Hailin Peng, 2024. "Waveguide-integrated twisted bilayer graphene photodetectors," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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