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arXiv 1706.04490cond-mat.mes-hallphysics.app-ph
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氟化石墨烯n-p结中的自旋反转

Spin inversion in fluorinated graphene n-p junction

Bartlomiej Rzeszotarski, Alina Mrenca-Kolasinska, Bartlomiej Szafran

摘要:

我们认为稀释的氟化石墨烯纳米粒子作为自旋活性元素。氟吸附原子引入局部自旋-轨道Rashba相互作用,引起电子通过时的自旋-旋进。在没有外部磁场的情况下,由于自旋进动的方向取决于电子动量,因此输运由吸附原子的多重散射主导,这抵消了自旋进动效应。如果费米能级电子以相同的动量多次通过同一吸附原子附近,自旋进动效应的积累是可能的。为了布置这些条件,可以通过例如原子力显微镜的尖端的电势将圆形n-p结引入到带。在量子霍尔条件下,电子电流沿着结被限制。电子自旋相互作用与本地Rashba场的变化与准束缚态的寿命,这是控制与结的边缘的耦合带。我们证明,自旋翻转概率可以以这种方式增加多达三个数量级。

英文摘要:

We consider a dilute fluorinated graphene nanoribbon as a spin-active element. The fluorine adatoms introduce a local spin-orbit Rashba interaction that induces spin-precession for electron passing by. In the absence of the external magnetic field the transport is dominated by multiple scattering by adatoms which cancels the spin precession effects, since the direction of the spin precession depends on the electron momentum. Accumulation of the spin precession effects is possible provided that the Fermi level electron passes many times near the same adatom with the same momentum. In order to arrange for these conditions a circular n-p junction can be introduced to the ribbon by e.g. potential of the tip of an atomic force microscope. In the quantum Hall conditions the electron current gets confined along the junction. The electron spin interaction with the local Rashba field changes with the lifetime of the quasi-bound states that is controlled with the coupling of the junction to the edge of the ribbon. We demonstrate that the spin-flip probability can be increased in this manner by as much as three orders of magnitude.

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