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首页> 外文期刊>Nanotechnology >Shot noise of charge current and spin current in the presence of Rashba interaction
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Shot noise of charge current and spin current in the presence of Rashba interaction

机译：在存在Rashba相互作用的情况下，电荷电流和自旋电流的散粒噪声

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摘要

We study fluctuations of spin current and charge current of two-terminal systems in the presence of spin-orbit interaction. Based on the scattering matrix theory, we obtain the general expressions for the fluctuations of various currents ( charge or spin current). It is well known that, for a two-terminal system, the auto-correlation function is enough to characterize the fluctuations for the charge current. Our result shows that, even for a conserved spin current, both auto-correlation and cross-correlation functions are needed to characterize the fluctuations of spin current when spin-orbit interaction are present. As a result, the cross-correlation of spin current may become positive, exhibiting bosonic behaviour. Indeed, our calculations on simple models show that the sign of the cross-correlation can be tuned by either the gate voltage or intra-dot coupling.
机译：我们研究在自旋轨道相互作用的存在下两端子系统的自旋电流和充电电流的波动。基于散射矩阵理论，我们获得了各种电流（电荷或自旋电流）波动的一般表达式。众所周知，对于两端子系统，自相关函数足以表征充电电流的波动。我们的结果表明，即使存在自旋电流守恒，当存在自旋轨道相互作用时，也需要自相关和互相关函数来表征自旋电流的波动。结果，自旋电流的互相关可能变为正，表现出玻色子行为。实际上，我们在简单模型上的计算表明，可以通过栅极电压或点内耦合来调整互相关的符号。

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