Greatly Enhanced Resonant Exciton‐trion Conversion in Electrically Modulated Atomically Thin WS2 at Room Temperature

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Greatly Enhanced Resonant Exciton‐trion Conversion in Electrically Modulated Atomically Thin WS2 at Room Temperature
Title:
Greatly Enhanced Resonant Exciton‐trion Conversion in Electrically Modulated Atomically Thin WS2 at Room Temperature
Journal Title:
Advanced Materials
Publication Date:
11 May 2023
Citation:
Wang, Z., Sebek, M., Liang, X., Elbanna, A., Nemati, A., Zhang, N., Goh, C. H. K., Jiang, M., Pan, J., Shen, Z., Su, X., Thanh, N. T. K., Sun, H., & Teng, J. (2023). Greatly Enhanced Resonant Exciton-trion Conversion in Electrically Modulated Atomically Thin WS2 at Room Temperature. Advanced Materials. Portico. https://doi.org/10.1002/adma.202302248
Abstract:
Excitonic resonance in atomically thin semiconductors offers a favorite platform to study 2D nanophotonics in both classical and quantum regimes and promises potentials for highly tunable and ultra-compact optical devices. The understanding of charge density dependent exciton-trion conversion is the key for revealing the underlaying physics of optical tunability. Nevertheless, the insufficient and inefficient light-matter interactions hinder the observation of trionic phenomenon and the development of excitonic devices for dynamic power-efficient electro-optical applications. Here, by engaging an optical cavity with atomically thin transition metal dichalcogenides (TMDCs), we demonstrate greatly enhanced exciton-trion conversion at room temperature (RT) and achieve electrical modulation of reflectivity of nearly 40% at exciton and 7% at trion state, which correspondingly enables a broadband large phase tuning in monolayer tungsten disulfide (WS2). Besides the absorptive conversion, almost 100% photoluminescence conversion from excitons to trions is observed at RT, illustrating a clear physical mechanism of an efficient exciton-trion conversion for extraordinary optical performance. The results indicate that both excitons and trions can play significant roles in electrical modulation of the optical parameters of TMDCs at RT. The work shows the real possibility for realizing electrical tunable and multi-functional ultra-thin optical devices using 2D materials.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation - Competitive Research Program
Grant Reference no. : NRF-CRP26-2021-0004

This research / project is supported by the A*STAR - Individual Research Grant
Grant Reference no. : A20E5c0084

This research / project is supported by the A*STAR - Individual Research Grant
Grant Reference no. : A2083c0058
Description:
This is the peer reviewed version of the following article: Wang, Z., Sebek, M., Liang, X., Elbanna, A., Nemati, A., Zhang, N., Goh, C. H. K., Jiang, M., Pan, J., Shen, Z., Su, X., Thanh, N. T. K., Sun, H., & Teng, J. (2023). Greatly Enhanced Resonant Exciton-trion Conversion in Electrically Modulated Atomically Thin WS2 at Room Temperature. Advanced Materials. Portico. https://doi.org/10.1002/adma.202302248, which has been published in final form at oi.org/10.1002/adma.202302248. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited."
ISSN:
1521-4095
0935-9648
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