论文标题
半导体量子点集合中有效自旋旋转相互作用的显微镜起源
Microscopic origin of the effective spin-spin interaction in a semiconductor quantum dot ensemble
论文作者
论文摘要
我们提出了一个单一充电量子点（QD）集合的微观模型，以揭示QD中电子自旋之间远程有效相互作用的起源。威尔逊的数值重归其化组（NRG）用于计算由生长诱导的润湿层介导的有效自旋旋转相互作用的大小和空间依赖性。令人惊讶的是，我们发现了一个非常短的QD间距离的抗磁性海森堡耦合，这是由非常低的填充润湿层带的明显颗粒孔不对称引起的。使用从现实参数获得的NRG结果作为大型QD集合的半经典模拟的输入，我们证明，可以通过我们的模型复制单个和两个颜色激光泵送之间相干旋转动态的实验报告的相移，从而求解了QD Interon Interon Spin Spin Spine互动的长期神秘的神秘之谜。
We present a microscopic model for a singly charged quantum dot (QD) ensemble to reveal the origin of the long-range effective interaction between the electron spins in the QDs. Wilson's numerical renormalization group (NRG) is used to calculate the magnitude and the spatial dependency of the effective spin-spin interaction mediated by the growth induced wetting layer. Surprisingly, we found an antiferromagnetic Heisenberg coupling for very short inter-QD distances that is caused by the significant particle-hole asymmetry of the wetting layer band at very low filling. Using the NRG results obtained from realistic parameters as input for a semiclassical simulation for a large QD ensemble, we demonstrate that the experimentally reported phase shifts in the coherent spin dynamics between single and two color laser pumping can be reproduced by our model, solving a longstanding mystery of the microscopic origin of the inter QD electron spin-spin interaction.
