Spin dephasing of fluorine-bound electrons in ZnSe
Spin dephasing of fluorine-bound electrons in ZnSe
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DOI：
10.1103/physrevb.85.121303
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发表时间：
2012-03-15
影响因子：
3.7
通讯作者：
Bayer, M.
中科院分区：
文献类型：
--
作者：
Greilich, A.;Pawlis, A.;Bayer, M.
本文用时间分辨抽运-探测克尔旋转研究了ZnSe外延层中与氟施主结合的电子系综的自旋相干性。在低温下，对于氟浓度为1 × 10 ~（15）cm ~（-3）的样品，发现了长寿命的自旋退相，其衰变时间可达T ~（-2）* = 33 ns。时间接近核自旋波动的极限，我们测量到的强度为1.65 mT。我们发现T-2* 在40 K以下是恒定的，在更高的温度下会有很大的下降。退相时间也随着氟浓度的增加而缩短，表明不同氟中心处的自旋之间存在相互作用。
The spin coherence of an ensemble of electrons bound to fluorine donors in epitaxially grown ZnSe layers is studied by time-resolved pump-probe Kerr rotation. Long-lived spin dephasing with decay times up to T-2* = 33 ns is found for a sample with a low fluorine concentration of 1 x 10(15) cm(-3) at cryogenic temperatures. The time is close to the limit set by nuclear-spin fluctuations, for which we measure a strength of 1.65 mT. We find T-2* to be constant up to 40 K, with a strong drop for higher temperatures. The dephasing time also shortens with increasing fluorine concentration, indicating an interaction between the spins at different fluorine centers.