arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08675cond-mat.mes-hallcond-mat.quant-gasquant-ph
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普适本征高阶自旋霍尔效应

Universal intrinsic higher-rank spin Hall effect

Junpeng Hou, Ying Su, Chuanwei Zhang

摘要:

自旋霍尔效应(SHE)是自旋电流不为零但电荷电流为零的基本输运现象,在自旋电子学中具有重要的应用。由于电子的半自旋性质,对于电荷和自旋霍尔效应,自旋电流的秩(由自旋张量的秩决定)被限制为0和1。受固态和冷原子系统中赝自旋1费米子研究的启发,本文引入并表征了大自旋($\geq 1$)系统中的高阶($\geq 2$)SHE.我们发现了一个普遍的秩2自旋霍尔电导率$e/{8}π$,零秩0和1电导率,自旋1模型与内禀自旋轨道耦合。类似的秩-2 SHE也可以在自旋-3/2系统中找到。提出了一种利用赝自旋为1的超冷费米子原子实现和测量秩为2的SHE的实验方案。我们的研究结果揭示了大自旋系统中新的自旋输运现象,并可能在设计创新的自旋电子器件中找到重要的应用。

英文摘要:

Spin Hall effect (SHE), a fundamental transport phenomenon with non-zero spin current but vanishing charge current, has important applications in spintronics for the electrical control of spins. Owing to the half-spin nature of electrons, the rank of spin current (determined by the rank of spin tensors) has been restricted to 0 and 1 for charge and spin Hall effects. Motivated by recent studies of pseudospin-1 fermions in solid state and cold atomic systems, here we introduce and characterize higher-rank ($\geq 2$) SHEs in large spin ($\geq 1$) systems. We find a universal rank-2 spin Hall conductivity $e/{8}π$, with zero rank-0 and 1 conductivities, for a spin-1 model with intrinsic spin-orbit coupling. Similar rank-2 SHEs can also be found in a spin-3/2 system. An experimental scheme is proposed to realize and measure rank-2 SHEs with pseudospin-1 ultracold fermionic atoms. Our results reveal novel spin transport phenomena in large spin systems and may find important applications in designing innovative spintronic devices.

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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