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arXiv 1206.6069cond-mat.mes-hallcond-mat.str-el
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近藤区分子磁体中电子输运的温度依赖性

Temperature dependence of electronic transport through molecular magnets in the Kondo regime

Maciej Misiorny, Ireneusz Weymann, Józef Barnaś

摘要:

在近藤制度中,有限温度的影响,通过纳米系统表现出单轴磁各向异性D,如分子磁体,吸附原子,或量子点侧耦合到一个大的自旋进行了分析。通过全密度矩阵数值重整化群方法计算了线性响应电导作为温度T、磁各向异性D和分子核自旋与轨道能级之间的交换耦合J的函数。结果表明,这样的系统显示两阶段的近藤效应作为温度的函数和作为交换耦合J的函数的量子相变。此外,额外的峰被发现在线性电导的温度的顺序T \sim |J|和T \simD。电导随温度的变化与交换耦合J的符号密切相关。

英文摘要:

The effects of finite temperature in transport through nanoscopic systems exhibiting uniaxial magnetic anisotropy D, such as molecular magnets, adatoms, or quantum dots side-coupled to a large spin are analyzed in the Kondo regime. The linear-response conductance is calculated by means of the full density-matrix numerical renormalization group method as a function of temperature T, magnetic anisotropy D, and exchange coupling J between the molecule's core spin and the orbital level. It is shown that such system displays a two-stage Kondo effect as a function of temperature and a quantum phase transition as a function of the exchange coupling J. Moreover, additional peaks are found in the linear conductance for temperatures of the order of T\sim|J| and T\simD. It is also shown that the conductance variation with T remarkably depends on the sign of the exchange coupling J.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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