Spin relaxation in wurtzite nanowires
Spin relaxation in wurtzite nanowires
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DOI：
10.1103/physrevb.98.035407
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发表时间：
2018-03
影响因子：
3.7
通讯作者：
M. Kammermeier;Paul Thomas Wenk;F. Dirnberger;D. Bougeard;J. Schliemann
中科院分区：
文献类型：
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作者：
M. Kammermeier;Paul Thomas Wenk;F. Dirnberger;D. Bougeard;J. Schliemann
我们从理论上研究了扩散纤锌矿半导体纳米线中的D 'yakonov-Perel'自旋弛豫性质及其对电导率量子修正的影响。虽然长寿命的自旋态的寿命是有限的占主导地位的k-线性自旋轨道的贡献在散装，这些条款显示在有限尺寸的纳米线几乎没有影响。在这里，自旋寿命基本上是由小的k-立方自旋轨道项和几乎独立的线半径。同时，这些态在真实的空间中具有复杂的螺旋结构，这种螺旋结构受到k-线性项引起的自旋进动长度的调制。由于这个原因，实验检测到的自旋弛豫很大程度上取决于纳米线半径和自旋进动长度之间的比率以及测量的类型。特别是，它示出，而半径的变化几乎不影响的磁导校正，这是由长寿命的自旋状态，在光学实验中观察到的自旋寿命的变化可以是戏剧性的。我们比较我们的结果与最近的实验研究纤锌矿InAs纳米线。
We theoretically investigate the D’yakonov-Perel’ spin-relaxation properties in diffusive wurtzite semiconductor nanowires and their impact on the quantum correction to the conductivity. Although the lifetime of the long-lived spin states is limited by the dominant k-linear spin-orbit contributions in the bulk, these terms show almost no effect in the finite-size nanowires. Here, the spin lifetime is essentially determined by the small k-cubic spin-orbit terms and nearly independent of the wire radius. At the same time, these states possess in general a complex helical structure in real space that is modulated by the spin-precession length induced by the k-linear terms. For this reason, the experimentally detected spin relaxation largely depends on the ratio between the nanowire radius and the spin-precession length as well as the type of measurement. In particular, it is shown that while a variation of the radius hardly affects the magnetoconductance correction, which is governed by the long-lived spin states, the change in the spin lifetime observed in optical experiments can be dramatic. We compare our results with recent experimental studies on wurtzite InAs nanowires.