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Issue 33, 2019
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One-dimensional nearly free electron states in borophene

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Two-dimensional boron (borophene) features structural polymorphs and distinct in-plane anisotropy, opening opportunities to achieve tailored electronic properties by intermixing different phases. Here, using scanning tunneling spectroscopy combined with first-principles calculations, delocalized one-dimensional nearly free electron states (NFE) in the (2,3) or β12 borophene sheet on the Ag(111) surface were observed. The NFE states emerge from a line defect in borophene, manifested as a structural unit of the (2,2) or χ3 sheet, which creates an in-plane potential well that shifts the states toward the Fermi level. The NFE states are held near the 2D plane of borophene, rather than in the vacuum region as observed in other nanostructures. Furthermore, borophene can provide a rare prototype to further study novel NFE behaviors, which may have potential applications in transport or field emission nanodevices based on boron.

Graphical abstract: One-dimensional nearly free electron states in borophene

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The article was received on 04 May 2019, accepted on 01 Aug 2019 and first published on 02 Aug 2019

Article type: Paper
DOI: 10.1039/C9NR03792F
Nanoscale, 2019,11, 15605-15611

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    One-dimensional nearly free electron states in borophene

    L. Kong, L. Liu, L. Chen, Q. Zhong, P. Cheng, H. Li, Z. Zhang and K. Wu, Nanoscale, 2019, 11, 15605
    DOI: 10.1039/C9NR03792F

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