Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot molecules
Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot molecules
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发表时间：
2013-10
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通讯作者：
Sicong Tian;C. Tong;Ren-Gang Wan;Y. Ning;Li-Jun Wang
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作者：
Sicong Tian;C. Tong;Ren-Gang Wan;Y. Ning;Li-Jun Wang
本文分析了用隧道耦合代替耦合激光控制的三量子点分子的相互作用。得到了探测激光场稳态线性磁化率的一般解析表达式，并证明了该系统可以呈现两个透明窗口。对探测激光脉冲的群速度进行了分析。通过改变隧道耦合，两个中心频率不同的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米/秒。我们将我们的分析扩展到多个量子点分子的情况下（量子点的数量为N），并表明该系统最多可以显示N-1个透明窗口。不同中心频率的激光脉冲最多可以被减慢n个。
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.