Ferroelectric brightening of spin‑forbidden dark excitons in a WSe<sub>2</sub>/hybrid-perovskite heterostructure.
basic_science · Level V
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- Record sourced from PubMed, PMID 42106345.
- Also identified by DOI 10.1038/s41467-026-72143-y.
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Abstract
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.