Attractive Interactions of Spin Polarons in the Quasi-One-Dimensional Spin-Density-Wave Background |
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| Authors: | Akira Terai Yoshiyuki Ono |
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| Institution: | 1. Department of Physics , University of Tokyo , Bunkyo-ku, Tokyo , 113 , Japan;2. Department of Physics , Toho University , Funabashi, Chiba , 274 , Japan |
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| Abstract: | Abstract The dynamics of spin polarons (spin bags) in the quasi-one- dimensional spin-density-wave background is numerically studied using the extended Peierls-Hubbard model. Interchain couplings are incorporated to the model as a staggered magnetic field. Time-dependent unrestricted Hartree-Fock equations and Newtonian equations are solved using Suzuki's decomposition of exponential operators. In the Hubbard model, the spin polarons with antiparallel spin polarizations attract each other. When the nearest-neighbor Coulomb repulsion is included, the interaction changes to a repulsive type. Further addition of an intersite electron-phonon coupling leads to an attractive interaction. |
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