Quantum transport through anisotropic molecular magnets: Hubbard Green function approach

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• 作者：Peng-Bin Niu^a ; ^{niupengbin123456@gmail.com} ; Yu-Ying Zhang^b ; Qiang Wang^a ; Yi-Hang Nie^a ; ^{nieyh@sxu.edu.cn}
• 关键词：Quantum transport ; Single molecular magnet ; Hubbard Green function approach ; Kondo regime
• 刊名：Physics Letters A
• 出版年：2012
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：26 March, 2012
• 卷：376
• 期：17
• 页码：1481-1488
• 文件大小：400 K

摘要

We extend the Green function approach to quantum transport through an anisotropic molecular magnet system with the help of Hubbard operators. Based on the single molecular magnet model, we reformulate the large spin and the total Hamiltonian in the language of Hubbard operators and obtain analytical expressions of the retarded Green function in sequential tunneling and Kondo regimes. In addition to this, we show the connection of our method to the master equation method in sequential regime and discuss a simple isotropic case in Kondo regime, in which we find a three-peak Kondo structure, a feature characterizing the isotropic exchange interaction between the localized electron and large spin.