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首页> 外文期刊>Physica, B. Condensed Matter >Conductance and spin polarization for a quantum wire with the competition of Rashba and Dresselhaus spinorbit coupling
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Conductance and spin polarization for a quantum wire with the competition of Rashba and Dresselhaus spinorbit coupling

机译：在Rashba和Dresselhaus自旋轨道耦合的竞争下，量子线的电导和自旋极化

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摘要

We investigate theoretically the spin transport of a quantum wire (QW) with weak Rashba and Dresselhaus spinorbit coupling (SOC) nonadiabatically connected to two normal leads. Using scattering matrix method and LandauerBttiker formula within effective free-electron approximation, we have calculated spin-dependent conductances G↑ and G↓, total conductance G and spin polarization P_z for a hard-wall potential confined QW. It is demonstrated that, the SOCs induce the splitting of G↑ and G↓ and form spin polarization P_z. Moreover, the conductances present quantized plateaus, the plateaus and P_z show oscillation structures near the subband edges. Furthermore, with the increase of QW width a strong spin polarization (Pz≈1) gradually becomes weak, which can be used to realize a spin filter. When the two SOCs coexist, the total conductance presents an isotropy transport due to the Rashba and Dresselhaus Hamiltonians being fixed, and the alteration of two SOCs strength ratio changes the sign of spin polarization. This may provide a way of realizing the expression of unit information by tuning gate voltage.
机译：我们从理论上研究了具有弱Rashba和Dresselhaus自旋轨道耦合（SOC）的非绝热连接到两个正常引线的量子线（QW）的自旋输运。在有效的自由电子近似中，使用散射矩阵法和LandauerBttiker公式，我们计算了硬壁势受限QW的自旋相关电导G↑和G↓，总电导G和自旋极化P_z。结果表明，SOC诱导了G↑和G↓的分裂并形成自旋极化P_z。此外，电导存在量化的平台，平台和P_z在子带边缘附近显示振荡结构。此外，随着QW宽度的增加，强自旋极化（Pz≈1）逐渐变弱，可用于实现自旋滤波器。当这两个SOC共存时，由于Rashba和Dresselhaus Hamilton固定，总电导呈现出各向同性迁移，并且两个SOC强度比的改变会改变自旋极化的迹象。这可以提供通过调节栅极电压来实现单位信息的表达的方式。

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