journal article·2019-02-12

Tunable Valley Polarized Plasmon-Exciton Polaritons in Two-Dimensional Semiconductors

Boyang Ding, Zhepeng Zhang, Yu-Hui Chen, Yanfeng Zhang, Richard J. Blaikie, Min Qiu

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Abstract

Monolayers of transition-metal dicalcogenides have emerged as two-dimensional semiconductors with direct bandgaps at degenerate but inequivalent electronic "valleys", supporting distinct excitons that can be selectively excited by polarized light. These valley-addressable excitons, when strongly coupled with optical resonances, lead to the formation of half-light half-matter quasiparticles, known as polaritons. Here we report self-assembled plasmonic crystals that support tungsten disulfide monolayers, in which the strong coupling of semiconductor excitons and plasmon lattice modes results in a Rabi splitting of ∼160 meV in transmission spectra as well as valley-polarized photoluminescence at room temperature. More importantly we find that one can flexibly tune the degree of valley polarization by changing either the emission angle or the excitation angle of the pump beam. Our results provide a platform that allows the detection, control, and processing of optical spin and valley information at the nanoscale under ambient conditions.
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Research context

OpenAlex topics: 2D Materials and Applications · Plasmonic and Surface Plasmon Research · Strong Light-Matter Interactions

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

Affiliations

MacDiarmid Institute for Advanced Materials and Nanotechnology, Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, Dunedin 9016, New Zealand

Department of Materials Science and Engineering, College of Engineering, Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, People’s Republic of China

School of Physics, Beijing Institute of Technology, Beijing 10081, People’s Republic of China

School of Engineering, Westlake University, Hangzhou 310024, People’s Republic of China

Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou 310024, People’s Republic of China

Funding

Ministry of Business, Innovation and Employment · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago

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