Suppressed decay of a laterally confined persistent spin helix
Suppressed decay of a laterally confined persistent spin helix
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横向限制的持续自旋螺旋的抑制衰变
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
G. Salis
中科院分区：
文献类型：
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作者：
P. Altmann;M. Walser;C. Reichl;W. Wegscheider;G. Salis
我们实验研究了2至80 μ m宽的蚀刻GaAs线结构中持续自旋螺旋的动力学。利用高空间分辨率的磁光克尔旋转，我们确定了自旋螺旋的寿命。在将自旋极化局部注入到线中之后的几纳秒，与二维情况相比，极化被强烈增强。这主要归因于向一维扩散的过渡，强烈抑制了自旋极化的扩散稀释。螺旋模的本征寿命仅微弱增加，这表明沟道限制只能部分抑制立方Dresselhaus自旋轨道相互作用。
We experimentally investigate the dynamics of a persistent spin helix in etched GaAs wire structures of 2 to 80 um width. Using magneto-optical Kerr rotation with high spatial resolution, we determine the lifetime of the spin helix. A few nanoseconds after locally injecting spin polarization into the wire, the polarization is strongly enhanced as compared to the two-dimensional case. This is mostly attributed to a transition to one-dimensional diffusion, strongly suppressing diffusive dilution of spin polarization. The intrinsic lifetime of the helical mode is only weakly increased, which indicates that the channel confinement can only partially suppress the cubic Dresselhaus spin-orbit interaction.