Nanosecond Ferroelectric Switching of Intralayer Excitons in Bilayer <math display=

Jing Liang; Yuan Xie; Dongyang Yang; Shangyi Guo; Kenji Watanabe; Takashi Taniguchi; Jerry I. Dadap; David Jones; Ziliang Ye

doi:10.1103/physrevx.15.021081

Journal article Nanosecond Ferroelectric Switching of Intralayer Excitons in Bilayer $3 R − {MoS}_{2}$ through Coulomb Engineering

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Jing Liang, Yuan Xie, Dongyang Yang, Shangyi Guo, Kenji Watanabe, Takashi Taniguchi, Jerry I. Dadap, David Jones, Ziliang Ye. Nanosecond Ferroelectric Switching of Intralayer Excitons in Bilayer

3 R − {MoS}_{2}

through Coulomb Engineering. Physical Review X. 2025, 15 (2), 021081. https://doi.org/10.1103/physrevx.15.021081

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High-speed, nonvolatile tunability is critical for advancing reconfigurable photonic devices used in neuromorphic information processing, sensing, and communication. Despite significant progress in developing phase-change and ferroelectric materials, achieving highly efficient, reversible, rapid switching of optical properties has remained a challenge. Recently, sliding ferroelectricity has been discovered in 2D semiconductors, which also host strong excitonic effects. Here, we demonstrate that these materials enable nanosecond ferroelectric switching in the complex refractive index, substantially modulating their linear optical responses. The maximum index modulation reaches about 4, resulting in a relative reflectance change exceeding 85%. Both on and off switching occur within 2.5 ns, with switching energy at femtojoule levels. The switching mechanism is driven by tuning the excitonic peak splitting of a rhombohedral molybdenum disulfide bilayer in an engineered Coulomb screening environment. This new switching mechanism establishes a new direction for developing high-speed, nonvolatile optical memories and highly efficient, compact reconfigurable photonic devices. Additionally, the demonstrated imaging technique offers a rapid method to characterize domains and domain walls in 2D semiconductors with rhombohedral stacking.

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