Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors
Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors
复制标题
自旋动力学对从扭曲光转移到扩展半导体的轨道角动量不敏感
DOI：
10.1103/physrevb.92.115301
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发表时间：
2015
影响因子：
3.7
通讯作者：
V. M. Axt
中科院分区：
文献类型：
--
作者：
M. Cygorek;P. I. Tamborenea;V. M. Axt
研究了半导体量子盘和量子威尔斯中载流子在轨道角动量光激发下的自旋动力学。我们发现，虽然扭曲的光传输轨道角动量的激发载流子和Rashba相互作用保持其总的角动量，由此产生的电子自旋动力学基本上是相同的激发与光的轨道角动量和。具有不同值的情况之间的差异是由于激发的状态略有不同的能量，而不是不同的角动量本身和消失的样品与大半径的空间准连续极限可以建立。这些发现不仅适用于Rashba相互作用，也适用于所有其他的自旋轨道哈密顿函数，如Dresselhaus耦合。
We study the spin dynamics of carriers due to the Rashba interaction in semiconductor quantum disks and wells after excitation with light with orbital angular momentum. We find that although twisted light transfers orbital angular momentum to the excited carriers and the Rashba interaction conserves their total angular momentum, the resulting electronic spin dynamics is essentially the same for excitation with light with orbital angular momentumand. The differences between cases with different values ofare due to the excitation of states with slightly different energies and not to the different angular momenta per se and vanish for samples with large radii where a-space quasicontinuum limit can be established. These findings apply not only to the Rashba interaction but also to all other envelope-function-approximation spin-orbit Hamiltonians like the Dresselhaus coupling.