One-dimensional nearly free electron states in borophene

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...

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Bibliographic Details
Published in:Nanoscale 2019-09, Vol.11 (33), p.1565-15611
Main Authors: Kong, Longjuan, Liu, Liren, Chen, Lan, Zhong, Qing, Cheng, Peng, Li, Hui, Zhang, Zhuhua, Wu, Kehui
Format: Article
Language:English
Subjects:
Anisotropy
Boron
Borophene
Dislocations
Electron states
Field emission
First principles
Free electrons
Mathematical analysis
Nanotechnology devices
Silver
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Summary: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 β 12 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 χ 3 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. One-dimensional nearly free electron states in borophene with line defects was revealed by STM/STS characterization and first-principles calculations.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr03792f