Theoretical Study on Frenkel Excitons in Mott–Jahn–Teller Insulator A4C60

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概要

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• We study low-energy excitations in the Mott–Jahn–Teller insulator A4C60 theoretically, where A is alkali metal. A model which takes account of both the electron–electron and electron–phonon interactions is employed and the low-energy excitations are calculated by using the Tamm–Dancoff approximation. It is found that the lowest excitation corresponds to the creation of the spin-singlet Frenkel excitons at about 0.3 eV and the next lowest excitation corresponds to the creation of the spin-triplet Frenkel excitons at about 0.6 eV. It is also found that the excitations of a pair of a free electron and a free hole lie over 0.8 eV. A remarkable point is that the spin-singlet Frenkel excitons are lower in energy than the spin-triplet Frenkel excitons in A4C60 in contrast to usual insulators.

• 社団法人日本物理学会の論文
• 2006-08-15

著者

• SUZUKI Shugo

  Institute of Materials Science, University of Tsukuba

• NAKAO Kenji

  Institute of Materials Science, University of Tsukuba

• Suzuki Shugo

  Univ. Tsukuba Ibaraki Jpn

• Suzuki Shugo

  Institute Of Materials Science University Of Tsukuba

• HIROSAWA Jin

  Institute of Materials Science, University of Tsukuba

• Hirosawa Jin

  Institute Of Materials Science University Of Tsukuba

• Nakao Kenji

  Institute Of Materials Science University Of Tsukiba

• Nakao Kenji

  Institute Of Materials Science Uneversity If Tsukuba

• Suzuki Shugo

  Institute of Material Science, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

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