Issue 33, 2019

One-dimensional nearly free electron states in borophene

Abstract

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

Supplementary files

Article information

Article type
Paper
Submitted
04 May 2019
Accepted
01 Aug 2019
First published
02 Aug 2019

Nanoscale, 2019,11, 15605-15611

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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