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
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SUZUKI Shugo
Institute of Materials Science, University of Tsukuba
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NAKAO Kenji
Institute of Materials Science, University of Tsukuba
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Suzuki Shugo
Univ. Tsukuba Ibaraki Jpn
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Suzuki Shugo
Institute Of Materials Science University Of Tsukuba
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HIROSAWA Jin
Institute of Materials Science, University of Tsukuba
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Hirosawa Jin
Institute Of Materials Science University Of Tsukuba
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Nakao Kenji
Institute Of Materials Science University Of Tsukiba
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Nakao Kenji
Institute Of Materials Science Uneversity If Tsukuba
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Suzuki Shugo
Institute of Material Science, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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