DMRG Studies on Properties of Undoped and Doped Molecule-Based Ferromagnetic Chain  

作　　者：YAO Kai-Lun QIN Yi LIU Qing-Mei LIU Zu-Li 

机构地区：[1]Department of Physics and State Key Laboratory of Laser Technology, Huazhong University of Science and Technology Wuhan 430074, China [2]International Center of Materials Physics, the Chinese Academy of Sciences, Shengyang 110015, China

出　　处：《Communications in Theoretical Physics》2005年第6X期1099-1102,共4页理论物理通讯（英文版）

基　　金：the National Natural Science Foundation of China under

摘　　要：By using density matrix renormalization group （DMRG） method a model for organic molecule-based ferromagnetic chain is proposed. It is found that the ground states of Undoped and doped systems both exhibit ferrimagnetic ordering. The e-e repulsion plays an important role in the stability of the ferromagnetic state either in doped system or undoped system. For the undoped system, each unit cell coatains half of the total spins, which is consistent with Lieb＇s theorem. It is convinced that when the system is doped with one electron, a charge density wave is excited, which decreases the amplitude of spin density wave,therefore acting against the stability of ferromagnetic state.

关 键 词：DMRG antiferromagnetic exchange SDW spin density undoped DOPED 

分 类 号：O481[理学—固体物理]