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Updated: Jun 13, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
In-Plane Field Enabled Dissociation Dynamics of Defect-Bound Excitons and Excitonic Oscillator Strength
Rupali Verma1, Utpreksh Patbhaje1, Mayank Shrivastava1
1Department of Electronic Systems Engineering, Indian Institute of Science Bangalore, Bangalore 560012, India.
Abstract:
Monolayer transition metal dichalcogenides (TMDs) host strongly bound many-particle excitonic complexes, providing a rich platform to develop insights into the intriguing questions related to many-body physics and light-matter interactions in quantum-confined 2D semiconductors. This work explores monolayer WS2, demonstrating how an in-plane electric field can dynamically redistribute oscillator strength among various excitonic states─from trions, charged biexcitons, and defect-bound (localized) excitons to neutral excitons. This field-induced redistribution unveils complex exciton-defect interactions and coupling mechanisms, elucidating their role in modulating many-body interactions and tuning the optoelectronic properties of the material. The observations contribute to understanding light-matter interactions in quantum-confined systems, with relevance to future tunable photonic devices and quantum information technology applications.
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