Band-gap opening in metallic carbon nanotubes adsorbed on H/Si(001)
- Authors
- Lee, Jung-Yup; Cho, Jun-Hyung
- Issue Date
- Jul-2006
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.89, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 89
- Number
- 2
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181279
- DOI
- 10.1063/1.2221909
- ISSN
- 0003-6951
- Abstract
- A recent scanning tunneling microscope nanolithography technique can fabricate one-dimensional "dangling-bond (DB) wire" by the selective removal of H atoms from a H-passivated Si(001) surface along the Si dimer row. We here theoretically investigate the bonding geometry, band structure, and.binding mechanism of an armchair (3,3) single-walled carbon nanotube (CNT) adsorbed on the DB wire. We find that the formation of C-Si bonds between the CNT and the DB wire gives rise to hybridization between the carbon pi-bond states and the Si dangling-bond states. This hybridization breaks the rotational symmetry of the (3,3) CNT whose pi-bonding and pi-antibonding bands cross at the Fermi level. As a result, the adsorbed CNT opens an energy gap of similar to 0.1 eV, yielding a metal-to-semiconductor transition.
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