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<p>Long-lived dark excitons in monolayer WSe<sub>2</sub> present promising candidates for carrying spin and valley information, but their optical access and spin manipulation have conventionally required the use of strong external magnetic fields. Here, using a ferroelectric hybrid perovskite heterostructure, we leverage the ferroelectric proximity effect to break the WSe<sub>2</sub>’s in-plane rotational symmetry and brighten the spin-forbidden dark excitons under zero magnetic field conditions. Furthermore, we show that the twist angle between the WSe<sub>2</sub> and perovskite crystals controls the ferroelectric coupling strength and valley-contrasting polarization. Our proposed mechanism, supported by a four-band tight-binding model, suggests that the ferroelectric proximity effect induces an asymmetric intersublattice interaction, generating an effective in-plane spin-orbit coupling (SOC) field that rotates spin/valley polarization and brightens dark excitons. Our work establishes ferroelectric proximity coupling as a symmetry-tunable, magnetic-field-free strategy for spin exciton control in two-dimensional semiconductors.</p>

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Ferroelectric brightening of spin‑forbidden dark excitons in a WSe2/hybrid-perovskite heterostructure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月9日

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  • Xinyun Wang,
  • Magdalena Grzeszczyk,
  • Maxim Trushin,
  • Ivan Verzhbitskiy,
  • Dmitrii Litvinov,
  • Yi Wei Ho,
  • Yuan Chen,
  • Zhenyue Wu,
  • Mykola Telychko,
  • Chuanqi Zhang,
  • Andres Granados del Aguila,
  • Kuan Eng Johnson Goh,
  • Xinwei Li,
  • Goki Eda,
  • Shaffique Adam,
  • Maciej Koperski,
  • Kian Ping Loh

摘要

Long-lived dark excitons in monolayer WSe2 present promising candidates for carrying spin and valley information, but their optical access and spin manipulation have conventionally required the use of strong external magnetic fields. Here, using a ferroelectric hybrid perovskite heterostructure, we leverage the ferroelectric proximity effect to break the WSe2’s in-plane rotational symmetry and brighten the spin-forbidden dark excitons under zero magnetic field conditions. Furthermore, we show that the twist angle between the WSe2 and perovskite crystals controls the ferroelectric coupling strength and valley-contrasting polarization. Our proposed mechanism, supported by a four-band tight-binding model, suggests that the ferroelectric proximity effect induces an asymmetric intersublattice interaction, generating an effective in-plane spin-orbit coupling (SOC) field that rotates spin/valley polarization and brightens dark excitons. Our work establishes ferroelectric proximity coupling as a symmetry-tunable, magnetic-field-free strategy for spin exciton control in two-dimensional semiconductors.