旁耦合于介观环与铁磁电极量子点系统中的自旋极化输运

借助单杂质Anderson模型哈密顿量,及利用格林函数和运动方程等理论,研究旁耦合于介观环和铁磁电极的量子点系统中的极化输运特性.结果表明,通过调节点-环耦合强度、铁磁电极中的极化强度、磁矩相对取向及温度等,均能实现控制体系中自旋极化电流的目的,达到自旋阀效应.为此系统作为一种新的自旋电子材料提供理论依据.

Spin-Flip Process through Double Quantum Dots Coupled to Ferromagnetic Leads

我们通过在系列联合到二铁磁性的领先的两倍量点调查旋转扭动过程。借助于奴隶波色子吝啬地的近似，我们为领先的二种不同配置在 Kondo 政体计算状态的密度。运输显示出取决于旋转扭动力量的一些显著性质，这被发现。这些效果可能在在 spintronics 利用电子关联的角色是有用的。

Spin-flip process through double quantum dots coupled to two half-metallic ferromagnetic leads

We investigate the spin-flip process through double quantum dots coupled to two half-metallic ferromagnetic leads in series. By means of the slave-boson mean-field approximation, we calculate the density of states in the Kondo regime for two different configurations of the leads. It is found that the transport shows some remarkable properties depending on the spin-flip strength. These effects may be useful in exploiting the role of electronic correlation in spintronics.

Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads and a Mesoscopic Ring

用运动技术的一个方程，我们在联合到铁磁性的领先和一枚 mesoscopic 戒指的一个量点调查 Kondo 效果。在点的费密水平的 Kondoresonance 在 mesoscopic 戒指与磁性的流动的增大和格子地点 N-R 的数字一起介绍周期的变化，这被显示出，并且为反平行的旋转 allignment ，为旋转起来和旋转下面配置的 Kondo 回声出现在一样的位置。然而为平行旋转 allignment， Kondo 回声 spilts 为 thespin 起来并且在配置下面旋转。

Cavity-Induced Self-Trapping of a Bose Josephson Junction

我们调查一个 Bose Josephson 连接自我套住，它散地被联合到一个驾驶的光洞。导致洞的非线性是介绍经分解，并且它的效果导致外观为在 Josephson 摆动政体的 Bose 爱因斯坦冷凝物自我套住。另外，在那里存在在非线性之间的竞争为出现由 interatomic 相互作用并且由驾驶的洞导致了自我套住。我们的结果证明驾驶的洞能作为一个可能的工具被利用生产为有弱 interatomic 的冷凝物自我套住相互作用。

Spin-dependent transport through an interacting quantum dot system

Using an equation of motion technique, we report on a theoretical analysis of transport characteristics of a spin- valve system formed by a quantum dot coupled to ferromagnetic leads, whose magnetic moments are oriented at an angle θ with respect to each other, and a mesoscopic ring by the Anderson Hamiltonian. We analyse the density of states of this system, and our results reveal that the density of states show some noticeable characteristics depending on the relative angle θ of magnetic moment M, and the spin-polarised strength P in ferromagnetic leads, and also the magnetic flux Φ and the number of lattice sites NR in the mesoscopic ring. These effects might have some potential applications in spintronics.

Spin-polarized transport through the T-shaped double quantum dots

Using the Keldysh nonequilibrium Green function and equation-of-motion technique, this paper investigates the spin-polarized transport properties of the T-shaped double quantum dots （DQD） coupled to two ferromagnetic leads. There are both Fano effect and Kondo effect in the system, and due to their mutual interaction, the density of states, the current, and the differential conductance of the system depend sensitively on the spin-polarized strength. Thus the obtained results show that this system is provided with excellent spin filtering property, which indicates that this system may be a candidate for spin valve transistors in the spintronics.

嵌入不同耦合强度的串联双量子点铁磁臂系统中的自旋反转输运

采用slave-boson平均场近似方法,通过对嵌入不同耦合强度的串联双量子点铁磁臂系统中的自旋反转输运这一问题的研究,发现无论双量子点系统处于弱耦合还是强耦合状态,Kondo共振峰都会出现不同结构的分裂,这主要是由于自旋反转作用改变了量子点的能级以及量子点间的耦合使得Kondo共振峰发生分裂。这些新奇的分裂现象使得这一双量子点系统的物理特性更有意义,它们将有助于解释自旋电子学中的电子强关联问题。