Long-range transport of 2D excitons with acoustic waves

Ruoming Peng, Adina Ripin, Yusen Ye, Jiayi Zhu, Changming Wu, Seokhyeong Lee, Huan Li, Takashi Taniguchi, Kenji Watanabe, Ting Cao, Xiaodong Xu and Mo Li ()
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Ruoming Peng: University of Washington
Adina Ripin: University of Washington
Yusen Ye: University of Washington
Jiayi Zhu: University of Washington
Changming Wu: University of Washington
Seokhyeong Lee: University of Washington
Huan Li: University of Washington
Takashi Taniguchi: Research Center for Functional Materials, National Institute for Materials Science
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Ting Cao: University of Washington
Xiaodong Xu: University of Washington
Mo Li: University of Washington

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to their long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the propagating potential traps induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches 20 μm, a distance at least ten times longer than the diffusion length and only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to the acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers up to room temperature.

Date: 2022
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DOI: 10.1038/s41467-022-29042-9

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