Anomalous Temperature Dependence of Coulomb Oscillations at Nearly Degenerate Levels

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Abstract

Peak heights of the Coulomb oscillation are examined based on the exact-diagonal calculations of many-body states in a quantum dot. where the Coulomb interaction energy is comparable with the one-electron level spacings. At nearly degenerate levels, high-spin states appear, in accordance with recent experimental results [Tarucha et at: Phys. Rev. Lett. 77 (1996) 3613], and some peaks of the conductance can increase with temperature. Two mechanisms are proposed for this anomalous temperature dependence. This phenomenon reflects a level spacing as small as one Kelvin and the total spin of the electronic states.

Original languageEnglish
Pages (from-to)2244-2247
Number of pages4
JournalJournal of the Physical Society of Japan
Volume66
Issue number8
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • Coulomb blockade
  • Coulomb oscillation
  • correlation effect
  • exact diagonalization
  • quantum dot

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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