Three-dimensional electronic spectroscopy of excitons in asymmetric double quantum wells
Three-dimensional electronic spectroscopy of excitons in asymmetric double quantum wells
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非对称双量子阱中激子的三维电子能谱
DOI：
10.1088/1367-2630/15/4/045028
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发表时间：
2011
影响因子：
3.3
通讯作者：
C. Jagadish
中科院分区：
文献类型：
--
作者：
J. Davis;C. Hall;L. V. Dao;K. Nugent;H. Quiney;H. Tan;C. Jagadish
我们利用一个三维（3D）的可见光谱，揭示和探索相干耦合局域化的GaAs量子威尔斯隔离的障碍4和6 nm宽的激子之间。耦合激子的能量分离43毫电子伏，接近纵向光学声子的能量，由于不同的宽度的量子威尔斯，他们被本地化。在3D光谱中分离相干路径的能力使得不仅可以识别弱相干耦合，而且可以通过分析峰形来探索耦合的性质。该峰形分析表明，定位于不同威尔斯阱的激子的不均匀加宽是不相关的，正如预期的那样，而定位于同一阱的重空穴激子和轻空穴激子之间的耦合被示出是相关的。为了深入了解耦合机制，我们探讨了耦合强度对势垒宽度的依赖性，从而空间分离。在此基础上讨论了声子辅助偶极耦合的可能性。
We utilize a three-dimensional (3D) visible spectroscopy to reveal and explore coherent coupling between excitons localized to GaAs quantum wells separated by barriers 4 and 6 nm wide. The coupled excitons were energetically separated by 43 meV, close to the longitudinal optical phonon energy, due to the different widths of the quantum wells to which they were localized. The ability to isolate coherence pathways in 3D spectroscopy has made it possible to not only identify weak coherent coupling, but also to explore the nature of the coupling through analysis of the peak shapes. This peak shape analysis showed inhomogeneous broadening of the excitons localized to different wells to be uncorrelated, as expected, while coupling between heavy-hole and light-hole excitons localized to the same well was shown to be correlated. To gain some insight into the coupling mechanism we explored the dependence of the coupling strength on the barrier width and hence spatial separation. Based on these results we discuss the possibility of phonon-assisted dipole coupling.
影响因子：
4.4
作者：
Kolli, Avinash;Nazir, Ahsan;Olaya-Castro, Alexandra
通讯作者：
Olaya-Castro, Alexandra