Optical transitions in quantum ring complexes
Optical transitions in quantum ring complexes
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DOI：
10.1103/physrevb.72.205301
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发表时间：
2005-11-01
影响因子：
3.7
通讯作者：
Koguchi, N
中科院分区：
文献类型：
--
作者：
Kuroda, T;Mano, T;Koguchi, N
利用液滴外延技术，我们实现了纳米级的量子环复合物，由一个明确的内环和一个外环。独特的量子系统中固有的电子结构进行了分析，使用microphotoluminescence技术。我们的生长方法的一个优点是，它提出了改变环的几何形状的可能性。两个样品的制备和研究：单壁环和同心双环。对于这两种样品，检测到从单个量子结构发射的高效光致发光。光谱显示离散的共振线，这反映了环型电子态的量子化性质。在同心双环结构中，内环和外环的载流子约束可以用分裂线来区分。单电子有效质量计算的基础上解释所观察到的光谱。
Making use of a droplet-epitaxial technique, we realize nanometer-sized quantum ring complexes, consisting of a well-defined inner ring and an outer ring. Electronic structure inherent in the unique quantum system is analyzed using a microphotoluminescence technique. One advantage of our growth method is that it presents the possibility of varying the ring geometry. Two samples are prepared and studied: a single-wall ring and a concentric double ring. For both samples, highly efficient photoluminescence emitted from a single quantum structure is detected. The spectra show discrete resonance lines, which reflect the quantized nature of the ring-type electronic states. In the concentric double ring, the carrier confinement in the inner ring and that in the outer ring are identified distinctly as split lines. The observed spectra are interpreted on the basis of single electron effective mass calculations.