,Coherent spectroscopy of a strongly driven triple quantum dot molecule

• 作 者: Xie Yan Duan Su-Qing Chu Wei-Dong Yang Ning
• 机 构: Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
• 出 处: 中国物理B（英文版）
• 发表日期: 2010年11期
• 关键词: coherent spectroscopy coupled quantum dots quantum transport photon assistance

Based on a calculation model, we study the interference phenomena of serially coupled V-type and A-type triple quantum dots (CTQDs) driven simultaneously by a strong driving field and a weak probe field. Strongly depending on the configuration of the three-level CTQD, the probe absorption spectra, which are shown in the tunneling current,exhibit various quantum coherence properties. In the case where the two pairs of transitions of the CTQD have a small eigenfrequency difference , the double-coupling effect of the driving field results in two Autler-Townes doublets and one weak Mollow triplet in one spectrum. With the value of increasing, only one Autler-Townes splitting remains due to the single-coupling of the field. We also find that the effect of spontaneous emission of phonons may lead to an obvious background current, which can be used to distinguish which transition is driven by the driving field in experiment. The interesting quantum property of a CTQD revealed in our results suggests its potential applications in quantum modulators and quantum logic devices.