Longitudinal ana transverse exciton-spin relaxation in a single InAsP quantum dot embedded inside a standing InP nanowire using photoluminescence spectroscopy
Longitudinal ana transverse exciton-spin relaxation in a single InAsP quantum dot embedded inside a standing InP nanowire using photoluminescence spectroscopy
复制标题
使用光致发光光谱法对嵌入直立 InP 纳米线内的单个 InAsP 量子点进行纵向和横向激子自旋弛豫
DOI：
10.1103/physrevb.85.075324
复制
发表时间：
2012
影响因子：
3.7
通讯作者：
笹倉弘理
中科院分区：
文献类型：
--
作者：
J.M. Park;S. Nakashima;M. Sohgawa;T. Kanashima;and M. Okuyama;高地満寿雄，山上紘平，高橋一匡，佐々木徹，菊池崇志，加藤有行;笹倉弘理
我们研究了嵌入InP纳米线中的单个InAsP量子点的光学性质。通过一阶光子相关测量，观察到激子态的横向激子自旋弛豫时间随激发功率的减小而延长。这一现象可以用纳米线中环境电荷的高斯涨落引起的运动窄化机制来解释。纵向激子-自旋弛豫时间由单纳米线量子点中激子态发射的随机偏振度来计算，采用基于Stokes参数表示的Mueller演算.随机极化分量随激发功率的降低而减少是由于InP纳米线中纤锌矿和锌-ZnO异质界面处的偶极子对电子和空穴的交换相互作用的抑制而引起的。
We have investigated the optical properties of a single InAsP quantum dot embedded in a standing InP nanowire. Elongation of the transverse exciton-spin relaxation time of the exciton state with decreasing excitation power was observed by first-order photon correlation measurements. This behavior is well explained by the motional narrowing mechanism induced by Gaussian fluctuations of environmental charges in the nanowire. The longitudinal exciton-spin relaxation time is evaluated by the degree of the random polarization of emission originating from exciton states confined in a single-nanowire quantum dot by using Mueller calculus based on Stokes parameters representation. The reduction in the random polarization component with decreasing excitation power is caused by suppression of the exchange interaction of electron and hole due to an optically induced internal electric field by the dipoles at the wurtzite and zinc-blende heterointerfaces in the InP nanowire.