Optical signatures of coupled quantum dots
Optical signatures of coupled quantum dots
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DOI：
10.1126/science.1121189
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发表时间：
2006-02-03
期刊：
影响因子：
56.9
通讯作者：
Gammon, D
中科院分区：
文献类型：
--
作者：
Stinaff, EA;Scheibner, M;Gammon, D
一对不对称的耦合InAs量子点通过外加电场被调谐成共振，从而使单个空穴形成相干的分子波函数。光谱显示出丰富的能级反交叉和交叉图案，可以理解为两个点的电荷和自旋组态的叠加。库仑相互作用使光激发态(带电激子)相对于基态(单电荷)的分子共振位移，使得量子点能够通过光诱导耦合。这一结果证明了光学耦合量子点在量子信息处理中应用的可能性。
An asymmetric pair of coupled InAs quantum dots is tuned into resonance by applying an electric field so that a single hole forms a coherent molecular wave function. The optical spectrum shows a rich pattern of level anticrossings and crossings that can be understood as a superposition of charge and spin configurations of the two dots. Coulomb interactions shift the molecular resonance of the optically excited state (charged exciton) with respect to the ground-state (single charge), enabling light-induced coupling of the quantum dots. This result demonstrates the possibility of optically coupling quantum dots for application in quantum information processing.