journal article·2022-02

In‐Plane Field‐Driven Excitonic Electro‐Optic Modulation in Monolayer Semiconductor

Daniele Vella, Marcelo B. Barbosa, Paolo E. Trevisanutto, Ivan Verzhbitskiy, Justin Yong Zhou, Kenji Watanabe, Takashi Taniguchi, Kotaro Kajikawa, Goki Eda

Advanced Optical Materials· Volume 10· Issue 4
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Abstract

Abstract 2D semiconductors are attractive candidates for on‐chip electro‐optic modulators due to their ease of integration and rich exciton‐mediated phenomena. While electrostatic doping and out‐of‐plane field effect have been extensively studied, in‐plane field‐induced phenomena remain largely unexplored. Here electro‐optic response of monolayer WSe 2 subject to modulating in‐plane electric fields probed by electroabsorption and electroreflectance spectroscopy is reported. The devices are found to exhibit spatially varying response near exciton resonance, which cannot be explained by predicted effects such as Pockels and excitonic Stark effect. It is shown that the modulation signal is dominated by exciton linewidth broadening and narrowing associated with local accumulation and depletion of free holes. The field and frequency dependence of the devices is distinct from those of charge modulation devices. The observed behavior is ascribed to elastic scattering of excitons with field‐driven intrinsic free carriers.
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Research context

OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics Faculty of Science National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

Centre for Advanced 2D Materials National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore

Faculty of Mechanical Engineering University of Ljubljana Aškerčeva 6 Ljubljana 1000 Slovenia

Dipartimento di Ingegneria Unita’ di Ricerca di Fisica non lineare e Modelli matematici Universita’ Campus Bio‐Medico Via Alvaro del Portillo 21 Roma 00154 Italy

Research Center for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

International Center for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

Department of Electrical and Electronic Engineering School of Engineering Tokyo Institute of Technology Nagatsuta, Midori‐ku Yokohama Kanagawa 226–8502 Japan

Department of Chemistry Faculty of Science National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore

Funding

Ministry of Education - Singapore · National Research Foundation Singapore · Japan Society for the Promotion of Science · Ministry of Education, Culture, Sports, Science and Technology

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