Deep subwavelength control of valley polarized cathodoluminescence in h-BN/WSe2/h-BN heterostructure

Liheng Zheng, Zhixin Liu, Donglin Liu, Xingguo Wang, Yu Li, Meiling Jiang, Feng Lin, Han Zhang, Bo Shen, Xing Zhu, Yongji Gong and Zheyu Fang ()
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Liheng Zheng: Peking University
Zhixin Liu: Peking University
Donglin Liu: Peking University
Xingguo Wang: Beihang University
Yu Li: Peking University
Meiling Jiang: Peking University
Feng Lin: Peking University
Han Zhang: Peking University
Bo Shen: Peking University
Xing Zhu: Peking University
Yongji Gong: Beihang University
Zheyu Fang: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Valley pseudospin in transition metal dichalcogenides monolayers intrinsically provides additional possibility to control valley carriers, raising a great impact on valleytronics in following years. The spin-valley locking directly contributes to optical selection rules which allow for valley-dependent addressability of excitons by helical optical pumping. As a binary photonic addressable route, manipulation of valley polarization states is indispensable while effective control methods at deep-subwavelength scale are still limited. Here, we report the excitation and control of valley polarization in h-BN/WSe2/h-BN and Au nanoantenna hybrid structure by electron beam. Near-field circularly polarized dipole modes can be excited via precise stimulation and generate the valley polarized cathodoluminescence via near-field interaction. Effective manipulation of valley polarization degree can be realized by variation of excitation position. This report provides a near-field excitation methodology of valley polarization, which offers exciting opportunities for deep-subwavelength valleytronics investigation, optoelectronic circuits integration and future quantum information technologies.

Date: 2021
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DOI: 10.1038/s41467-020-20545-x

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