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Nano-spectroscopy of excitons in atomically thin transition metal dichalcogenides

Author

Listed:
  • Shuai Zhang

    (Columbia University)

  • Baichang Li

    (Columbia University)

  • Xinzhong Chen

    (Brookhaven National Laboratory
    Stony Brook University)

  • Francesco L. Ruta

    (Columbia University
    Columbia University)

  • Yinming Shao

    (Columbia University)

  • Aaron J. Sternbach

    (Columbia University)

  • A. S. McLeod

    (Columbia University)

  • Zhiyuan Sun

    (Columbia University)

  • Lin Xiong

    (Columbia University)

  • S. L. Moore

    (Columbia University)

  • Xinyi Xu

    (Columbia University)

  • Wenjing Wu

    (Columbia University)

  • Sara Shabani

    (Columbia University)

  • Lin Zhou

    (Columbia University)

  • Zhiying Wang

    (Columbia University)

  • Fabian Mooshammer

    (Columbia University)

  • Essance Ray

    (University of Washington)

  • Nathan Wilson

    (University of Washington)

  • P. J. Schuck

    (Columbia University)

  • C. R. Dean

    (Columbia University)

  • A. N. Pasupathy

    (Columbia University)

  • Michal Lipson

    (Columbia University)

  • Xiaodong Xu

    (University of Washington)

  • Xiaoyang Zhu

    (Columbia University)

  • A. J. Millis

    (Columbia University)

  • Mengkun Liu

    (Brookhaven National Laboratory
    Stony Brook University)

  • James C. Hone

    (Columbia University)

  • D. N. Basov

    (Columbia University)

Abstract

Excitons play a dominant role in the optoelectronic properties of atomically thin van der Waals (vdW) semiconductors. These excitons are amenable to on-demand engineering with diverse control knobs, including dielectric screening, interlayer hybridization, and moiré potentials. However, external stimuli frequently yield heterogeneous excitonic responses at the nano- and meso-scales, making their spatial characterization with conventional diffraction-limited optics a formidable task. Here, we use a scattering-type scanning near-field optical microscope (s-SNOM) to acquire exciton spectra in atomically thin transition metal dichalcogenide microcrystals with previously unattainable 20 nm resolution. Our nano-optical data revealed material- and stacking-dependent exciton spectra of MoSe2, WSe2, and their heterostructures. Furthermore, we extracted the complex dielectric function of these prototypical vdW semiconductors. s-SNOM hyperspectral images uncovered how the dielectric screening modifies excitons at length scales as short as few nanometers. This work paves the way towards understanding and manipulation of excitons in atomically thin layers at the nanoscale.

Suggested Citation

  • Shuai Zhang & Baichang Li & Xinzhong Chen & Francesco L. Ruta & Yinming Shao & Aaron J. Sternbach & A. S. McLeod & Zhiyuan Sun & Lin Xiong & S. L. Moore & Xinyi Xu & Wenjing Wu & Sara Shabani & Lin Zh, 2022. "Nano-spectroscopy of excitons in atomically thin transition metal dichalcogenides," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28117-x
    DOI: 10.1038/s41467-022-28117-x
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    3. Archana Raja & Andrey Chaves & Jaeeun Yu & Ghidewon Arefe & Heather M. Hill & Albert F. Rigosi & Timothy C. Berkelbach & Philipp Nagler & Christian Schüller & Tobias Korn & Colin Nuckolls & James Hone, 2017. "Coulomb engineering of the bandgap and excitons in two-dimensional materials," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
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    Cited by:

    1. Shuai Zhang & Yang Liu & Zhiyuan Sun & Xinzhong Chen & Baichang Li & S. L. Moore & Song Liu & Zhiying Wang & S. E. Rossi & Ran Jing & Jordan Fonseca & Birui Yang & Yinming Shao & Chun-Ying Huang & Tak, 2023. "Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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