Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots
Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots
复制标题
单个 InAs/GaAs 量子点中中性激子自旋的光学排列和偏振转换
DOI：
10.1103/physrevb.77.161305
复制
发表时间：
2008
影响因子：
3.7
通讯作者：
Paul Voisin
中科院分区：
文献类型：
--
作者：
K. Kowalik;K. Kowalik;O. Krebs;Aristide Lemaître;J. Gaj;Paul Voisin
我们研究了在磁场中通过光学取向和激子极化的转换在单个的$\mathrm{In}\mathrm {As}闪烁{Ga}\mathrm{As}$自组装量子点中的激子自旋记忆。准共振声子辅助激发被成功地用来定义中性激子的初始自旋极化。沿着沿着明亮的激子本征轴产生的线性偏振的守恒高达90%，并且从圆偏振到线性偏振的转换高达47%，这两者都表明相对于辐射寿命的非常长的自旋弛豫时间。结果进行了定量比较，包括重轻空穴混合的赝自旋模型$1 scin 2$。
We investigate exciton spin memory in individual $\mathrm{In}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the linear polarization generated along the bright exciton eigenaxes of up to 90% and the conversion from circular to linear polarization of up to 47% both demonstrate a very long spin relaxation time with respect to the radiative lifetime. Results are quantitatively compared to a model of pseudospin $1∕2$ including heavy-to-light hole mixing.