Dynamics of an Acoustic Bipolaron in One-Dimensional Electron-Lattice Systems : Condensed Matter: Electronic Properties, etc.
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概要
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The dynamical properties of an acoustic bipolaron in non-degenerate conjugated polymers such as polydiacetylene (PDA), which can be regarded as one-dimensional electron-lattice systems, are studied through numerical simulations. In these simulations, use has been made of Su-Schrieffer-Heeger's model extended to involve on -site as well as nearest-neighbor electron-electron Coulomb repulsion terms. The electron-electron interactions are treated within the unrestricted Hartree-Fock approximation. It is confirmed that the velocity of the acoustic bipolaron accelerated by a constant electric field saturates at the sound velocity of the system, and that the width of the bipolaron shrinks to zero as its velocity approaches the saturation velocity (= sound velocity). The effective mass of a bipolaron is estimated to be several hundred timed as heavy as the free electron mass, in the case of PDA. These properties are compared with those of a polaron.
- 社団法人日本物理学会の論文
- 2000-04-15
著者
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Ozawa Toshiyuki
Department Of Physics Toho University
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Ono Yoshiyuki
Department Of Physicis Toho University
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Ozawa Toshiyuki
Department Of Dermatology Osaka City University Graduate School Of Medicine
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Ozawa Toshiyuki
Department of Physics, Toho University
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