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*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)18163−18171
JournalACS Nano
Volume15
Issue number11
Online published3 Nov 2021
DOIs
Publication statusPublished - 23 Nov 2021

Research Keywords

  • microfiber
  • photonic spin-orbit interaction
  • TMDCs
  • unidirectional transport
  • valley polarization
  • valley trions emission

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