一维铁磁/有机系统的基态与自旋分布研究  

Ground state properties and spin density of ferromagnetic metal/conjugated polymer system

作　　者：李宏[1] 程杰[1] 冯名诚[1] 王鹿霞[1] 刘德胜[2] 解士杰[2] 

机构地区：[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

出　　处：《原子与分子物理学报》2004年第2期321-326,331,共7页Journal of Atomic and Molecular Physics

基　　金：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。

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。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.

关 键 词：电子自旋注入 自旋输运 极化子 双极化子 

分 类 号：O469[理学—凝聚态物理]