Related papers: Ferroelectric brightening of spin forbidden dark excitons in a WSe2/hybrid perovskite heterostructure

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

URL: http://arxiv.org/abs/2606.06128v1
Date: Thu, 04 Jun 2026 13:16:07 GMT
Title: Ferroelectric brightening of spin forbidden dark excitons in a WSe2/hybrid perovskite heterostructure
Abstract summary: Long-lived dark excitons in monolayer WSe2 present promising candidates for carrying spin and valley information.<n>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.<n>Our work establishes ferroelectric proximity coupling as an electrically reconfigurable, magnetic-field-free strategy for spin exciton control in two-dimensional semiconductors.
Score: 4.778115716690098
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: 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 an electrically reconfigurable, magnetic-field-free strategy for spin exciton control in two-dimensional semiconductors.

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