Coulomb staircase in STM current through granular films

H. Imamura, J. Chiba, S. Mitani, K. Takanashi, S. Takahashi, S. Maekawa, H. Fujimori

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


The tunneling current through a junction array consisting of a scanning tunneling microscope tip and a granular film is studied both theoretically and experimentally. When the tunnel resistance between the tip and a granule on the surface is much larger than those between granules, a bottleneck of the tunneling current is created in the array and the Coulomb staircase (CS) appears in the (Formula presented) curve at room temperature. It is shown that the period of the CS is given by the capacitance at the bottleneck even though a granular film consists of many tunnel junctions with different capacitances. Our study provides a possibility for single-electron-spin-electronic devices at room temperature.

Original languageEnglish
Pages (from-to)46-49
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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