Fig. 4
From: Optical control of polarization in ferroelectric heterostructures
Mechanism of the photo-induced switching. a Illustration of the electric fields Eσ and \(E_{\mathrm{\sigma }}^\prime\) in BTO and MoS2, respectively, a built-in electric field Ebi and the negative charge σ accumulated at the interface when BTO is switched to the Pup state. b Generation of the polar excitons under optical illumination resulting in compensation of the interfacial charge σ, decrease of the associated field Eσ, and polarization reversal to the Pdown state favored by Ebi
