Tailoring MoS2 Valley-Polarized Photoluminescence with Super Chiral Near-Field

Li, Ziwei, Liu, Changxu, Rong, Xin, Luo, Yang, Cheng, Haotian, Zheng, Liheng, Lin, Feng, Shen, Bo, Gong, Yongji, Zhang, Shuang and Fang, Zheyu (2018) Tailoring MoS2 Valley-Polarized Photoluminescence with Super Chiral Near-Field. Advanced Materials, 30 (34). p. 1801908. ISSN 0935-9648

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Official URL: https://doi.org/10.1002/adma.201801908


Transition metal dichalcogenides with intrinsic spin–valley degrees of freedom hold great potentials for applications in spintronic and valleytronic devices. MoS2 monolayer possesses two inequivalent valleys in the Brillouin zone, with each valley coupling selectively with circularly polarized photons. The degree of valley polarization (DVP) is a parameter to characterize the purity of valley-polarized photoluminescence (PL) of MoS2 monolayer. Usually, the detected values of DVP in MoS2 monolayer show achiral property under optical excitation of opposite helicities due to reciprocal phonon-assisted intervalley scattering process. Here, it is reported that valley-polarized PL of MoS2 can be tailored through near-field interaction with plasmonic chiral metasurface. The resonant field of the chiral metasurface couples with valley-polarized excitons, and tailors the measured PL spectra in the far-field, resulting in observation of chiral DVP of MoS2-metasurface under opposite helicities excitations. Valley-contrast PL in the chiral heterostructure is also observed when illuminated by linearly polarized light. The manipulation of valley-polarized PL in 2D materials using chiral metasurface represents a viable route toward valley-polaritonic devices.

Item Type: Article
Additional Information: Funding Information: National Key Research and Development Program of China. Grant Number: 2017YFA0205700 National Basic Research Program of China. Grant Numbers: 2015CB932403, 2017YFA0206000 National Science Foundation of China. Grant Numbers: 11674012, 61422501, 11374023, 61521004, 21790364 Foundation for the Author of National Excellent Doctoral Dissertation of P. R. China. Grant Number: 201420 National Program for Support of Top-notch Young Professionals. Grant Number: W02070003
Uncontrolled Keywords: photoluminescence, MoS2, metasurface, exciton–plasmon interactions
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 14 Sep 2021 10:56
Last Modified: 14 Sep 2021 11:00
URI: http://nrl.northumbria.ac.uk/id/eprint/47180

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