Resonant spin orientation at the exciton level anticrossing in InP quantum dots
Resonant spin orientation at the exciton level anticrossing in InP quantum dots
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DOI：
10.1103/physrevb.77.115331
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
Y. Masumoto;Kenta Toshiyuki;Tsukasa Suzuki;M. Ikezawa
中科院分区：
文献类型：
--
作者：
Y. Masumoto;Kenta Toshiyuki;Tsukasa Suzuki;M. Ikezawa
在 InP 量子点 (QD) 中激子的两个反交叉点周围的线性偏振准共振激发下观察到激子的共振自旋取向。在1.5和$2.5\phantom{\rule{0.3em}{0ex}}\mathrm{T}$的纵向和倾斜磁场下，发生亮激子和暗激子的两次反交叉。在反交叉点，亮激子和暗激子相互混合，波函数混合引起共振自旋取向。时间分辨圆偏振清楚地显示了由于反交叉点处明激子和暗激子混合而产生的共振自旋方向。暗激子由于其寿命长，可以作为载流子和自旋库。我们证明磁场可以控制量子点的自旋纠缠和共振自旋方向。
Resonant spin orientation of excitons was observed under linearly polarized quasiresonant excitation around two anticrossing points of excitons in InP quantum dots (QDs). Under the longitudinal and tilted magnetic fields of 1.5 and $2.5\phantom{\rule{0.3em}{0ex}}\mathrm{T}$, two anticrossings of bright and dark excitons take place. At the anticrossing points, bright and dark excitons mix with each other and the wave function mixing induces the resonant spin orientation. Time-resolved circular polarization clearly showed the resonant spin orientation due to mixing of bright and dark excitons at the anticrossing points. Dark excitons can work as the carrier and spin reservoir because of their long lifetime. We demonstrated that magnetic field can control the spin entanglement and the resonant spin orientation of QDs.