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arXiv 1310.4599physics.opticscond-mat.mes-hall
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三重和多重量子点分子中的隧穿诱导透明和可控群速度

Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot molecules

Si-Cong Tian, Cun-Zhu Tong, Ren-Gang Wan, Yong-Qiang Ning, Li-Jun Wang

摘要:

我们分析了三重量子点分子之间的相互作用,这些相互作用是由隧穿耦合而不是耦合激光控制的。本文给出了探测光场的稳态线性极化率的一般解析表达式,并证明了该系统可以出现两个透明窗口。分析了探测激光脉冲的群速度。通过改变隧道耦合,中心频率不同的两个激光脉冲可以以相同的群速度传播。在我们的系统中,群速度可以低至300 m/s。我们将我们的分析扩展到多个量子点分子的情况(量子点的数量为N),并表明该系统可以表现出最多N-1个透明窗口。最多可以减慢N-1个不同中心频率的激光脉冲。

英文摘要:

We analyze the interaction of a triple quantum dot molecules controlled by the tunneling coupling instead of coupling laser. A general analytic expression for the steady-state linear susceptibility for a probe-laser field is obtained and we show that the system can exhibit two transparency windows. The group velocity of the probe-laser pulse is also analyzed. By changing the tunneling couplings, two laser pulses with different central frequency can propagate with the same group velocity. And the group velocity can be as low as 300 m/s in our system. We extend our analysis to the case of multiple quantum dot molecules (the number of the quantum dots is N) and show that the system can exhibit at most N-1 transparency windows. And at most N-1 laser pulses with different central frequencies can be slowed down.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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