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arXiv 0907.4078cond-mat.mes-hallcond-mat.mtrl-sci
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对称量子阱中子带间自旋轨道相互作用引起的自旋霍尔效应

Spin Hall effect due to intersubband-induced spin-orbit interaction in symmetric quantum wells

Minchul Lee, Marco O. Hachiya, E. Bernardes, J. Carlos Egues, Daniel Loss

摘要:

研究了具有两个子带的量子阱中二维电子气的内禀自旋霍尔效应,其中存在一种新的子带间诱导的自旋轨道耦合。体自旋霍尔电导率$σ^z_{xy}$计算在弹道极限内的标准Kubo形式主义中存在的磁场$B$,并发现保持有限的B=0的限制,只要只有最低的子带被占用。我们计算的$σ^z_{xy}$表现出非单调的行为,并可以改变其符号的费米能量(载流子面密度$n_{2D}$)的子带边缘之间的变化。通过对子带间自旋-轨道耦合的自洽计算,我们确定了实际InSb量子阱中$σ^z_{xy}$的大小。

英文摘要:

We investigate the intrinsic spin Hall effect in two-dimensional electron gases in quantum wells with two subbands, where a new intersubband-induced spin-orbit coupling is operative. The bulk spin Hall conductivity $σ^z_{xy}$ is calculated in the ballistic limit within the standard Kubo formalism in the presence of a magnetic field $B$ and is found to remain finite in the B=0 limit, as long as only the lowest subband is occupied. Our calculated $σ^z_{xy}$ exhibits a nonmonotonic behavior and can change its sign as the Fermi energy (the carrier areal density $n_{2D}$) is varied between the subband edges. We determine the magnitude of $σ^z_{xy}$ for realistic InSb quantum wells by performing a self-consistent calculation of the intersubband-induced spin-orbit coupling.

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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