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Title: Energy-gap opening in a Bi(110) nanoribbon induced by edge reconstruction
Authors: Sun, J.-T. 
Huang, H. 
Wong, S.L.
Gao, H.-J.
Feng, Y.P. 
Wee, A.T.S. 
Issue Date: 11-Dec-2012
Citation: Sun, J.-T., Huang, H., Wong, S.L., Gao, H.-J., Feng, Y.P., Wee, A.T.S. (2012-12-11). Energy-gap opening in a Bi(110) nanoribbon induced by edge reconstruction. Physical Review Letters 109 (24) : -. ScholarBank@NUS Repository.
Abstract: Scanning tunnelling microscopy and spectroscopy experiments complemented by first-principles <?format ?>calculations have been conducted to study the electronic structure of 4 monolayer Bi(110) nanoribbons on epitaxial graphene on silicon carbide [4H-SiC(0001)]. In contrast with the semimetal property of elemental bismuth, an energy gap of 0.4ÂeV is measured at the centre of the Bi(110) nanoribbons. Edge reconstructions, which can facilitate the edge strain energy release, are found to be responsible for the band gap opening. The calculated density of states around the Fermi level are decreased quickly to zero from the terrace edge to the middle of a Bi(110) nanoribbon potentially signifying a spatial metal-to-semiconductor transition. This study opens new avenues for room-temperature bismuth nanoribbon-based electronic devices. © 2012 American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.109.246804
Appears in Collections:Staff Publications

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