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Strained two-dimensional tungsten diselenide for mechanically tunable exciton transport

Author

Listed:
  • Jin Myung Kim

    (University of Illinois at Urbana-Champaign
    University of California, Irvine)

  • Kwang-Yong Jeong

    (Chungnam National University)

  • Soyeong Kwon

    (University of California, Irvine)

  • Jae-Pil So

    (Seoul National University
    Soongsil University)

  • Michael Cai Wang

    (University of Illinois at Urbana-Champaign
    University of South Florida)

  • Peter Snapp

    (University of Illinois at Urbana-Champaign)

  • Hong-Gyu Park

    (Seoul National University)

  • SungWoo Nam

    (University of California, Irvine
    University of California, Irvine)

Abstract

Tightly bound electron-hole pairs (excitons) hosted in atomically-thin semiconductors have emerged as prospective elements in optoelectronic devices for ultrafast and secured information transfer. The controlled exciton transport in such excitonic devices requires manipulating potential energy gradient of charge-neutral excitons, while electrical gating or nanoscale straining have shown limited efficiency of exciton transport at room temperature. Here, we report strain gradient induced exciton transport in monolayer tungsten diselenide (WSe2) across microns at room temperature via steady-state pump-probe measurement. Wrinkle architecture enabled optically-resolvable local strain (2.4%) and energy gradient (49 meV/μm) to WSe2. We observed strain gradient induced flux of high-energy excitons and emission of funneled, low-energy excitons at the 2.5 μm-away pump point with nearly 45% of relative emission intensity compared to that of excited excitons. Our results strongly support the strain-driven manipulation of exciton funneling in two-dimensional semiconductors at room temperature, opening up future opportunities of 2D straintronic exciton devices.

Suggested Citation

  • Jin Myung Kim & Kwang-Yong Jeong & Soyeong Kwon & Jae-Pil So & Michael Cai Wang & Peter Snapp & Hong-Gyu Park & SungWoo Nam, 2024. "Strained two-dimensional tungsten diselenide for mechanically tunable exciton transport," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-55135-8
    DOI: 10.1038/s41467-024-55135-8
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