Field emission spectra of single-atom tips with thermodynamically stable structures

E. Rokuta, H. S. Kuo, T. Itagaki, K. Nomura, T. Ishikawa, B. L. Cho, I. S. Hwang, T. T. Tsong, C. Oshima

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Energy spectra of field emitted electrons from well-characterized tungsten nanoemitters covered with different metals have been measured in detail while changing the electric field and the topmost atomic structure. At very high electric fields, additional humps appear in the spectra of a single-atom tip. Their energy positions depend on both the coated material and structure termination but not on the electric field. On the other hand, their intensities increase with increasing field. The current spectra did not include either peculiar features attributable to resonant tunneling or electric-field penetration, or significantly narrow FWHM, but are rather analogous to those of the conventional metallic field emitters. The spectral features along with a recent ab-initio theory indicate a large reduction in the tunneling barrier height in front of the single-atom electron source.

Original languageEnglish
Pages (from-to)2508-2512
Number of pages5
JournalSurface Science
Volume602
Issue number14
DOIs
Publication statusPublished - 2008 Jul 15

Fingerprint

Field emission
field emission
emission spectra
Electric fields
Atoms
electric fields
atoms
Coated materials
Electron sources
Resonant tunneling
Tungsten
electron sources
resonant tunneling
Full width at half maximum
atomic structure
tungsten
emitters
energy spectra
penetration
Metals

Keywords

  • Facet
  • Field emission spectroscopy
  • Metallic monolayer films
  • Surface electronic phenomena

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Rokuta, E., Kuo, H. S., Itagaki, T., Nomura, K., Ishikawa, T., Cho, B. L., ... Oshima, C. (2008). Field emission spectra of single-atom tips with thermodynamically stable structures. Surface Science, 602(14), 2508-2512. https://doi.org/10.1016/j.susc.2008.05.038

Field emission spectra of single-atom tips with thermodynamically stable structures. / Rokuta, E.; Kuo, H. S.; Itagaki, T.; Nomura, K.; Ishikawa, T.; Cho, B. L.; Hwang, I. S.; Tsong, T. T.; Oshima, C.

In: Surface Science, Vol. 602, No. 14, 15.07.2008, p. 2508-2512.

Research output: Contribution to journalArticle

Rokuta, E, Kuo, HS, Itagaki, T, Nomura, K, Ishikawa, T, Cho, BL, Hwang, IS, Tsong, TT & Oshima, C 2008, 'Field emission spectra of single-atom tips with thermodynamically stable structures', Surface Science, vol. 602, no. 14, pp. 2508-2512. https://doi.org/10.1016/j.susc.2008.05.038
Rokuta E, Kuo HS, Itagaki T, Nomura K, Ishikawa T, Cho BL et al. Field emission spectra of single-atom tips with thermodynamically stable structures. Surface Science. 2008 Jul 15;602(14):2508-2512. https://doi.org/10.1016/j.susc.2008.05.038
Rokuta, E. ; Kuo, H. S. ; Itagaki, T. ; Nomura, K. ; Ishikawa, T. ; Cho, B. L. ; Hwang, I. S. ; Tsong, T. T. ; Oshima, C. / Field emission spectra of single-atom tips with thermodynamically stable structures. In: Surface Science. 2008 ; Vol. 602, No. 14. pp. 2508-2512.
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AU - Cho, B. L.

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AB - Energy spectra of field emitted electrons from well-characterized tungsten nanoemitters covered with different metals have been measured in detail while changing the electric field and the topmost atomic structure. At very high electric fields, additional humps appear in the spectra of a single-atom tip. Their energy positions depend on both the coated material and structure termination but not on the electric field. On the other hand, their intensities increase with increasing field. The current spectra did not include either peculiar features attributable to resonant tunneling or electric-field penetration, or significantly narrow FWHM, but are rather analogous to those of the conventional metallic field emitters. The spectral features along with a recent ab-initio theory indicate a large reduction in the tunneling barrier height in front of the single-atom electron source.

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