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20 August 2020 Modulating valley dynamics in a monolayer semiconductor with active chiral metamaterials
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Abstract
Monolayer semiconductors with spin-dependent contrasting phenomena at K and K’ valleys feature addressable valley degree of freedom for valleytronic applications. Herein, we demonstrate that chiral Purcell effects can versatilely control the relaxation of targeted valley excitons at monolayer semiconductors, allowing the actively tunable modulation of valley dynamics at room temperature. We achieve the tunable valley modulation by embedding a monolayer WSe2 in our model system, known as a moiré chiral metamaterial, with actively controllable chiral plasmonic modes. Our work provides advanced understanding on mechanisms to distinguish the effects of spin-dependent excitation and near-field-controlled relaxation on valley emission in hybrid systems of valley excitons and plasmonic cavities. We have also shown that large room-temperature valley modulation can be achieved outside of strong-coupling regime with active tunability.
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Zilong Wu and Yuebing Zheng "Modulating valley dynamics in a monolayer semiconductor with active chiral metamaterials", Proc. SPIE 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII, 114621N (20 August 2020); https://doi.org/10.1117/12.2567833
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