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Title: The thinnest light disk: rewritable data storage and encryption on WS₂ monolayers
Authors: Zhao, Weiwei
Cai, Shuang
Wei, Xin
Zheng, Ting
Xu, Xin
Zafar, Amina
Liu, Hongwei
Yu, Ting
Lu, Junpeng
Chen, Yunfei
Ni, Zhenhua
Keywords: Science::Physics
Issue Date: 2021
Source: Zhao, W., Cai, S., Wei, X., Zheng, T., Xu, X., Zafar, A., Liu, H., Yu, T., Lu, J., Chen, Y. & Ni, Z. (2021). The thinnest light disk: rewritable data storage and encryption on WS₂ monolayers. Advanced Functional Materials, 31(36), 2103140-.
Journal: Advanced Functional Materials
Abstract: The thinnest light disk is demonstrated at the atomic level by developing an erasable method to directly write encrypted information onto WS₂ monolayers. The write-in is realized by precise control of photoluminescence emission by means of ozone functionalization and scanning focused laser beam. The visual decryption and reading-out of information are enabled by fluorescence contrast. The high encryption level is ensured by the threshold power upon which the data deletion will be triggered. Owing to the high spatial resolution and power sensitivity, the storage capacity within <1 nm thickness can be up to ≈62.5 MB cm⁻², and the writing speed can reach ≈6.25 MB s⁻¹. Density functional theory calculations suggest that the disk formatting is realized by ozone molecule adsorption induced localized unoccupied states, while the read-in relies on the passivation of defects via substitution of the sulfur vacancies with oxygen atoms. The results of this study promote data storage and encryption on the atomic scale.
ISSN: 1616-301X
DOI: 10.1002/adfm.202103140
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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