论文标题
电子旋转与核与半导体纳米结构相互作用的动态极化
Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures
论文作者
论文摘要
我们建议一种针对局部电子的新旋转定向机制：$ dynamic〜etricon〜spin〜pallization〜〜〜核〜自旋波动$提供的〜。电子的角动量通过弱磁场中的超精细相互作用从核自旋系统中获得。为此，样品被非极化光照亮，该光线直接偏振电子和核。我们预测，对于局部激子中结合的电子，可以在几个millitesla的纵向磁场中达到100％自旋极化。原理实验的证明是在（Al）AS/alas量子点中的动量间接激子上进行的，其中在17 mT的磁场中测量了30％的电子自旋极化。
We suggest a new spin orientation mechanism for localized electrons: $dynamic~electron~spin~polarization~provided~by~nuclear~spin~fluctuations$. The angular momentum for the electrons is gained from the nuclear spin system via the hyperfine interaction in a weak magnetic field. For this the sample is illuminated by an unpolarized light, which directly polarizes neither the electrons nor the nuclei. We predict, that for the electrons bound in localized excitons 100% spin polarization can be reached in longitudinal magnetic fields of a few millitesla. The proof of principle experiment is performed on momentum-indirect excitons in (In,Al)As/AlAs quantum dots, where in a magnetic field of 17 mT the electron spin polarization of 30% is measured.
