Luo Xiao-Qing, Li Zeng-Zhao, Jing Jun, Xiong Wei, Li Tie-Fu, Yu Ting
Beijing Computational Science Research Center, Beijing, 100193, China.
Department of Physics, Zhejiang University, Hangzhou, 310027, Zhejiang, China.
Sci Rep. 2018 Feb 15;8(1):3107. doi: 10.1038/s41598-018-21221-3.
We theoretically investigate the spectral features of tunneling-induced transparency (TIT) and Autler-Townes (AT) doublet and triplet in a triple-quantum-dot system. By analyzing the eigenenergy spectrum of the system Hamiltonian, we can discriminate TIT and double TIT from AT doublet and triplet, respectively. For the resonant case, the presence of the TIT does not exhibit distinguishable anticrossing in the eigenenergy spectrum in the weak-tunneling regime, while the occurrence of double anticrossings in the strong-tunneling regime shows that the TIT evolves to the AT doublet. For the off-resonance case, the appearance of a new detuning-dependent dip in the absorption spectrum leads to double TIT behavior in the weak-tunneling regime due to no distinguished anticrossing occurring in the eigenenergy spectrum. However, in the strong-tunneling regime, a new detuning-dependent dip in the absorption spectrum results in AT triplet owing to the presence of triple anticrossings in the eigenenergy spectrum. Our results can be applied to quantum measurement and quantum-optics devices in solid systems.
我们从理论上研究了三量子点系统中隧穿诱导透明（TIT）以及Autler-Townes（AT）双峰和三峰的光谱特性。通过分析系统哈密顿量的本征能谱，我们可以分别将TIT和双TIT与AT双峰和三峰区分开来。对于共振情况，在弱隧穿 regime 中，TIT的存在在本征能谱中未表现出可区分的反交叉，而在强隧穿 regime 中出现的双反交叉表明TIT演化为AT双峰。对于非共振情况，吸收光谱中出现的与失谐相关的新凹陷在弱隧穿 regime 中由于本征能谱中未出现明显的反交叉而导致双TIT行为。然而，在强隧穿 regime 中，吸收光谱中与失谐相关的新凹陷由于本征能谱中存在三重反交叉而导致AT三峰。我们的结果可应用于固体系统中的量子测量和量子光学器件。
