Optical observation of single-electron charging effect at room temperature

Yoichi Uehara, Sadauki Ohyama, Kimihiko Ito, Sukekatsu Ushioda

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12 Citations (Scopus)


By optical spectroscopy we have observed the single-electron charging effect of a small Au particle at room temperature. The high energy cut-off ℏω-max$/ of visible light emitted by a sample under a scanning tunneling microscope (STM) is ordinarily equal to eV0 where V0 is the tip-sample bias voltage. However, when the electron is injected into a small Au particle (diameter approx.6 nm) that is quasi-isolated on a thin insulator layer, the cut-off energy shifts below eV0. The physics that underlies the observed optical effect is common with that of previously observed Coulomb blockade and Coulomb staircase.

Original languageEnglish
Pages (from-to)L167-L170
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number2 A
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)


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