Ultrafast single-electron transfer in coupled quantum dots driven by a few-cycle chirped pulse
Ultrafast single-electron transfer in coupled quantum dots driven by a few-cycle chirped pulse
复制标题
由几个周期啁啾脉冲驱动的耦合量子点中的超快单电子转移
DOI：
10.1063/1.4871400
复制
发表时间：
2014
影响因子：
3.2
通讯作者：
Lee Ray-Kuang
中科院分区：
文献类型：
--
作者：
Yang Wen-Xing;Chen Ai-Xi;Bai Yanfeng;Lee Ray-Kuang
本文从理论上研究了在非线性啁啾少周期激光脉冲驱动下，单电子在耦合双量子点（QD）结构基态之间的超快转移。对不含旋转波近似的时变薛定谔方程进行了数值求解。通过选择适当的啁啾速率参数值和脉冲强度，我们在数值上证明了单个电子完全转移的可能性。即使存在量子点系统的自发发射和脱相过程，也可以在很宽的脉冲参数范围内实现单电子的高效相干转移。我们的研究结果说明了通过非线性啁啾参数控制在耦合量子点系统中利用少周期脉冲进行激励的潜力，并对实验实现的设计具有指导意义。
We theoretically study the ultrafast transfer of a single electron between the ground states of a coupled double quantum dot (QD) structure driven by a nonlinear chirped few-cycle laser pulse. A time-dependent Schrodinger equation without the rotating wave approximation is solved numerically. We demonstrate numerically the possibility to have a complete transfer of a single electron by choosing appropriate values of chirped rate parameters and the intensity of the pulse. Even in the presence of the spontaneous emission and dephasing processes of the QD system, high-efficiency coherent transfer of a single electron can be obtained in a wide range of the pulse parameters. Our results illustrate the potential to utilize few-cycle pulses for the excitation in coupled quantum dot systems through the nonlinear chirp parameter control, as well as a guidance in the design of experimental implementation.