论文标题
在半导体量子点纳米粒子复合结构中使用常规搅动脉冲的有效激子产生
Efficient exciton generation in a semiconductor quantum dot-metal nanoparticle composite structure using conventional chirped pulses
论文作者
论文摘要
我们考虑一种纳米结构，该纳米结构由与金属纳米颗粒耦合的半导体量子点组成，并通过数值模拟显示量子点的激子状态，即使对于小粒子间距离，也可以从地面状态下牢固地生成，即使用与高斯和超质体的传统脉动相关的小颗粒脉冲。在最终的激子种群中观察到的相对于所施加脉冲的CHIRP符号观察到的不对称性是使用描述系统的非线性密度矩阵方程来解释的，并且归因于来自量子点与金属纳米机构中的量子点和等离子的激子之间的相互作用的实际参数的实际部分。传统chir的脉冲的简单性也可以在实验室中很容易实施，这使得提出的可靠量子控制方案可能对使用半导体量子点的超快纳米开关和量子信息处理任务有可能有用。
We consider a nanostructure consisting of a semiconductor quantum dot coupled to a metal nanoparticle, and show with numerical simulations that the exciton state of the quantum dot can be robustly generated from the ground state even for small interparticle distances, using conventional chirped pulses with Gaussian and hyperbolic secant envelopes. The asymmetry observed in the final exciton population with respect to the chirp sign of the applied pulses is explained using the nonlinear density matrix equations describing the system, and is attributed to the real part of the parameter emerging from the interaction between excitons in the quantum dot and plasmons in the metal nanoparticle. The simplicity of the conventional chirped pulses, which can also be easily implemented in the laboratory, make the proposed robust quantum control scheme potentially useful for the implementation of ultrafast nanoswitches and quantum information processing tasks with semiconductor quantum dots.
