受多体效应影响的平行双量子点结构中的自旋输运

采用非平衡态格林函数方法,研究了一个三电极的平行双量子点结构中由局域Rashba型自旋轨道耦合诱导的自旋极化的电子输运.结果发现,当电子从"源"电极经量子点区到两个"漏"电极时,它能根据自身的自旋态选择终端,即自旋极化和自旋分离可在这一结构同时实现.同时发现,量子点内的库仑相互作用对该体系的自旋输运性质有重要影响,其中有额外电极与之耦合的量子点中的库仑相互作用的强度对自旋输运起主要调节作用.

Many-Body Effect on Spinning Electron Transport in a Parallel Double Quantum Dot Structure

The spinning electron transport for the spin polarization induced by local Rashba spinorbit coupling in a three-terminal parallel double-quantum-dot structure is theoretically studied by the nonequilibrium Green function method. It was found that when the electrons come from the source terminal to two drain terminals through quantum dot region, they can select a specific terminal in accordance to the spin state, i.e., the spin polarization and spin separation can both be simultaneously performed in such a structure. Meanwhile, the intra-dot Coulomb interaction affects greatly the spinning electron transport of the system where the intensity of Coulomb interaction in the quantum dot, which is coupled with the additional terminal, plays an important adjusting role in spinning electron transport.