Two- versus three-dimensional quantum confinement in indium phosphide wires and dots
Two- versus three-dimensional quantum confinement in indium phosphide wires and dots
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DOI：
10.1038/nmat942
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发表时间：
2003-08
期刊：
影响因子：
41.2
通讯作者：
Heng Yu;Jingbo Li;Richard A. Loomis;Lin-wang Wang;W. E. Buhro
中科院分区：
文献类型：
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作者：
Heng Yu;Jingbo Li;Richard A. Loomis;Lin-wang Wang;W. E. Buhro
带隙的尺寸依赖性是半导体中量子限制的最可识别的方面;带隙随着纳米结构尺寸的减小而增加。一维（1D）限制的威尔斯，2D限制的线，和3D限制的点的带隙应该随着尺寸的不同，作为限制的不同维度的结果演变。然而，类似的1D，2D或3D约束系统没有系统的实验比较。在这里，我们报告生长的磷化铟（InP）量子线的直径在强约束制度，和它们的带隙与以前报道的InP量子点，的比较。我们提供了理论证据，以建立在InP线中观察到的量子限制被削弱到预期的程度，相对于在InP点，由一个限制尺寸的损失。量子线有时表现为量子点串，我们提出了一个分析，一般区分量子线量子点的行为。
The size dependence of the bandgap is the most identifiable aspect of quantum confinement in semiconductors; the bandgap increases as the nanostructure size decreases,,. The bandgaps in one-dimensional (1D)-confined wells, 2D-confined wires, and 3D-confined dots should evolve differently with size as a result of the differing dimensionality of confinement. However, no systematic experimental comparisons of analogous 1D, 2D or 3D confinement systems have been made. Here we report growth of indium phosphide (InP) quantum wires having diameters in the strong-confinement regime, and a comparison of their bandgaps with those previously reported for InP quantum dots,,,. We provide theoretical evidence to establish that the quantum confinement observed in the InP wires is weakened to the expected extent, relative to that in InP dots, by the loss of one confinement dimension. Quantum wires sometimes behave as strings of quantum dots, and we propose an analysis to generally distinguish quantum-wire from quantum-dot behaviour.