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Updated: May 14, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
Magneto-Polarization Controlled by Intervalley Scattering of Interlayer Excitons and Carriers in WS2/WSe2
Yongzhi She1, Yufei Jiang1, Jinlong Yang1
1Department of Physics, University of Science and Technology of China, Hefei 230026, China.
Abstract:
The photoluminescence polarization of interlayer excitons (IXs) offers a powerful tool for exploring moiré physics of transition metal dichalcogenide (TMD) heterostructures. However, in WS2/WSe2 heterostructures, this polarization is often weak and the underlying mechanism of intervalley scattering remains unclear. Notably, the closeness of IX lifetime and carrier valley lifetime complicates the investigation of the scattering process. Here, we demonstrate that magnetic fields can sensitively tune the polarization and valley dynamics of both IX and carriers in WS2/WSe2 heterostructures. We find that small magnetic fields can suppress IX intervalley scattering, significantly enhancing valley polarization, whereas at higher magnetic fields, IX emission is largely controlled by the intervalley scattering of electrons, leading to excitation-dependent polarization and saturation effects. Our results highlight the interplay between carrier dynamics and exciton valley behaviors in tailoring IX photoluminescence and offering potential pathways for the design of valleytronic devices leveraging TMD heterostructures.
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