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首页> 外文期刊>Physical review >Spin-flip Scattering In Time-dependent Transport Through A Quantum Dot: Enhanced Spin-current And Inverse Tunneling Magnetoresistance
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Spin-flip Scattering In Time-dependent Transport Through A Quantum Dot: Enhanced Spin-current And Inverse Tunneling Magnetoresistance

机译：通过量子点的时间依赖性传输中的自旋翻转散射：增强的自旋电流和逆隧穿磁阻

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摘要

We study the effects of spin-flip scatterings on the time-dependent transport properties through a magnetic quantum dot attached to normal and ferromagnetic leads. The transient spin dynamics as well as the steady-state tunneling magnetoresistance (TMR) of the system are investigated. The absence of a definite spin-quantization axis requires the time propagation of two-component spinors. We present numerical results in which the electrodes are treated both as one-dimensional tight-binding wires and in the wide-band limit approximation. In the latter case we derive a transparent analytic formula for the spin-resolved current, and transient oscillations damped over different time scales are identified. We also show that in the presence of spin-flip scatterings the TMR can be inverted even for symmetrically coupled leads. For any given strength of the spin-flip coupling the TMR becomes negative provided the ferromagnetic polarization is larger than some critical value, Finally we show how the full Knowledge of the transient response allows for enhancing the spin current by properly tuning the period of a pulsed bias.
机译：我们研究了通过自旋翻转散射对附着在正常和铁磁引线上的磁性量子点的时间依赖性传输特性的影响。研究了系统的瞬态自旋动力学以及稳态隧穿磁阻（TMR）。缺少确定的自旋量子化轴需要两组分自旋子的时间传播。我们提出了数值结果，其中电极既被视为一维紧束线，也被视为宽带极限近似值。在后一种情况下，我们导出了自旋分辨电流的透明解析公式，并确定了在不同时间范围内衰减的瞬态振荡。我们还表明，在存在自旋翻转散射的情况下，即使对于对称耦合的引线，TMR也可以反转。对于任何给定的自旋-翻转耦合强度，只要铁磁极化大于某个临界值，TMR就会变为负值，最后，我们将展示关于瞬态响应的完整知识如何通过适当调整脉冲周期来增强自旋电流偏压。

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