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<p>In transition metal dichalcogenides, the valley degree of freedom directly couples valley-polarized excitons, excited by circularly polarized light to valley-dependent chiral photons, enabling ultrafast light-driven valleytronics. However, achieving fully integrated valley optoelectronics, incorporating on-chip in situ generation, selective routing and electrical readout of valley-dependent chiral photons, remains an unresolved challenge. Here we present a valley-driven hybrid optoelectronic nanocircuit that integrates chirality-selective meta-waveguide photodetectors with transition metal dichalcogenides. At room temperature, our purposely designed meta-waveguide device generates near-unity valley-dependent chiral photons in the second-harmonic generation from an encapsulated tungsten disulfide monolayer and selectively couples them to unidirectional waveguide modes, achieving an exceptional polarization selectivity of 0.97. These valley-dependent waveguide modes were subsequently detected by atomically thin few-layer tungsten diselenide photodetectors, exclusively responsive to the above-bandgap upconverted photons, thereby enabling all-on-chip processing of valley-multiplexed images. Our demonstration bridges a critical gap in lightwave valleytronics, paving the way for compact, programmable and scalable valley information processing and fostering the development of light-based valleytronic quantum technologies.</p>

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An on-chip programmable valley optoelectronic nanocircuit

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Chi Li,
  • Kaijian Xing,
  • Wenhao Zhai,
  • Luca Sortino,
  • Andreas Tittl,
  • Igor Aharonovich,
  • Michael S. Fuhrer,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Qingdong Ou,
  • Zhaogang Dong,
  • Stefan A. Maier,
  • Haoran Ren

摘要

In transition metal dichalcogenides, the valley degree of freedom directly couples valley-polarized excitons, excited by circularly polarized light to valley-dependent chiral photons, enabling ultrafast light-driven valleytronics. However, achieving fully integrated valley optoelectronics, incorporating on-chip in situ generation, selective routing and electrical readout of valley-dependent chiral photons, remains an unresolved challenge. Here we present a valley-driven hybrid optoelectronic nanocircuit that integrates chirality-selective meta-waveguide photodetectors with transition metal dichalcogenides. At room temperature, our purposely designed meta-waveguide device generates near-unity valley-dependent chiral photons in the second-harmonic generation from an encapsulated tungsten disulfide monolayer and selectively couples them to unidirectional waveguide modes, achieving an exceptional polarization selectivity of 0.97. These valley-dependent waveguide modes were subsequently detected by atomically thin few-layer tungsten diselenide photodetectors, exclusively responsive to the above-bandgap upconverted photons, thereby enabling all-on-chip processing of valley-multiplexed images. Our demonstration bridges a critical gap in lightwave valleytronics, paving the way for compact, programmable and scalable valley information processing and fostering the development of light-based valleytronic quantum technologies.