Positive magnetoconductance of hopping conduction due to correlation effect

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Abstract

The correlation effect is investigated on the hopping conduction in a magnetic field which is observed in strongly Anderson-localized regime. We calculate the electronic states in the Hubbard model with disordered on-site energies and suggest a new mechanism of the positive magnetoconductance: Zeeman effect increases the number of the high spin states in which the orbitals at the Fermi level are more extended owing to the weaker correlation effect than in the low spin states. The mechanism can explain the magnetoconductance independent of the direction of the magnetic field which was observed in a Cu-particles film. The positive magnetoconductance should be also observable in an array of quantum dots.

Original languageEnglish
Pages (from-to)1113-1114
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Volume194-196
Issue numberPART 1
DOIs
Publication statusPublished - 1994 Feb 2

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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