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arXiv 0705.0648cond-mat.mes-hall
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磁控量子点自旋晶体管理论

Theory of a Magnetically-Controlled Quantum-Dot Spin Transistor

Daniel Urban, Matthias Braun, Jürgen König

摘要:

我们研究通过一个量子点耦合到三个铁磁铅在弱隧道耦合制度的运输。有限的源极-漏极电压在原本非磁性的量子点上产生非平衡自旋。这种自旋积累导致磁阻。铁磁但无电流的基极通过非相干自旋翻转过程和相干自旋进动影响量子点的自旋。由于点自旋决定了器件的电导,这允许纯磁性晶体管式操作。我们分析了这两种类型的过程中的电流在不同的几何形状的效果。

英文摘要:

We examine transport through a quantum dot coupled to three ferromagnetic leads in the regime of weak tunnel coupling. A finite source-drain voltage generates a nonequilibrium spin on the otherwise non-magnetic quantum dot. This spin accumulation leads to magnetoresistance. A ferromagnetic but current-free base electrode influences the quantum-dot spin via incoherent spin-flip processes and coherent spin precession. As the dot spin determines the conductance of the device, this allows for a purely magnetic transistor-like operation. We analyze the effect of both types of processes on the electric current in different geometries.

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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