| 一维铁磁/有机系统的基态与自旋分布研究 |
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| 引用本文： | 李宏,程杰,冯名诚,王鹿霞,刘德胜,解士杰. 一维铁磁/有机系统的基态与自旋分布研究[J]. 原子与分子物理学报, 2004, 21(2): 321-326 |
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| 作者姓名： | 李宏 程杰 冯名诚 王鹿霞 刘德胜 解士杰 |
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| 作者单位： | 1. 济宁师专物理系,山东,272025
2. 山东大学物理与微电子学院,济南,250100 |
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| 基金项目： | 国家自然科学基金(批准号:90103034,10074040); 山东省自然科学基金(批准号:Y2001A05)的资助课题. |
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| 摘 要： | 文中用一维紧束缚模型描述铁磁金属,用一维非简并的Su-Schrieffer -Heeger (SSH)模型描述共轭聚合物,研究了在一维铁磁/共轭聚合物系统和一维CMR材料/ 聚合物系统中的电子转移和自旋转移.发现在聚合物部分没有自旋的双极化子比有自旋的极化子具有较低的能量而容易产生.然而在铁磁CMR材料/聚合物系统中极化子的产生能低于聚合物中极化子的产生能,增加了有机物中自旋极化输运的可能性.
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| 关 键 词： | 电子自旋注入 自旋输运 极化子 双极化子 |
| 文章编号： | 1000-0364(2004)02-0321-07 |
Ground state properties and spin density of ferromagnetic metal/conjugated polymer system |
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| LI Hong,CHENG Jie,FENG Ming-cheng,WANG Lu-xia,LIU De-sheng,XIE Shi-jie. Ground state properties and spin density of ferromagnetic metal/conjugated polymer system[J]. Journal of Atomic and Molecular Physics, 2004, 21(2): 321-326 |
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| Authors: | LI Hong CHENG Jie FENG Ming-cheng WANG Lu-xia LIU De-sheng XIE Shi-jie |
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| Affiliation: | LI Hong~1,CHENG Jie~1,FENG Ming-cheng~1,WANG Lu-xia~1,LIU De-sheng~2,XIE Shi-jie~2 |
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| Abstract: | In this paper the charge and spin transfer in ferromagnetic metal/conjugated polymer system were investigated. We used an one-dimensional nondegenerate Su-Schrieffer-Heeger (SSH) Hamiltonian to describe the conjugated polymer and one-dimensional tight-binding model to describe the ferromagnetic metal. It was found that bipolarons were the lowest energy charge state in the bulk polymer. As a result electrons (or holes) transferred into the bulk of the polymer form spinless bipolarons. However, the creation energy of polaron in the ferromagnetic metal was lower than that in ferromagnetic CMR/conjugated polymer system, which made it possible the spin polarization transfer in conjugated polymers. |
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| Keywords: | Spin inject Spin transfer Polaron Bipolaron |
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