journal article·2021-11-23Open access

Long-Range Directional Routing and Spatial Selection of High-Spin-Purity Valley Trion Emission in Monolayer WS2

Pei-Gang Chen, Zhiyong Li, Yun Qi, Tsz Wing Lo, Shubo Wang, Wei Jin, Kwok-Yin Wong, Shanhui Fan, Anatoly V. Zayats, Dangyuan Lei

ACS Nano· Volume 15· Issue 11

Abstract

Valley-dependent excitation and emission in transition metal dichalcogenides (TMDCs) have recently emerged as a new avenue for optical data manipulation, quantum optical technologies, and chiral photonics. The valley-polarized electronic states can be optically addressed through photonic spin–orbit interaction of excitonic emission, typically with plasmonic nanostructures, but their performance is limited by the low quantum yield of neutral excitons in TMDC multilayers and the large Ohmic loss of plasmonic systems. Here, we demonstrate a valleytronic system based on the trion emission in high-quantum-yield WS2 monolayers chirally coupled to a low-loss microfiber. The integrated system uses the spin properties of the waveguided modes to achieve long-range directional routing of valley excitations and also provides an approach to selectively address valley-dependent emission from different spatial locations around the microfiber. This valleytronic interface can be integrated with fiber communication devices, allowing for merging valley polarization and chiral photonics as an alternative mechanism for optical information transport and manipulation in classical and quantum regimes.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Graphene research and applications

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

Affiliations

Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China

State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 999077, China

Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China

Department of Physics, City University of Hong Kong, Hong Kong 999077, China

Department of Electrical Engineering and Ginzton Laboratory, Stanford University, Stanford, California 94305-4088, United States

Department of Physics and London Centre for Nanotechnology, King’s College London, Strand, London WC2R 2LS, U.K.

Funding

Engineering and Physical Sciences Research Council · Research Grants Council, University Grants Committee · Office of Naval Research · City University of Hong Kong · H2020 Excellent Science · The Hong Kong Polytechnic University

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