Zanolli Z, Pistol M-E, Fröberg L E, Samuelson L
Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, S-221 00 Lund, Sweden.
J Phys Condens Matter. 2007 Jul 25;19(29):295219. doi: 10.1088/0953-8984/19/29/295219. Epub 2007 Jun 11.
We report the detection of quantum confinement in single InAs-InP core-shell nanowires. The wires, having an InAs core with ∼25 nm diameter, are characterized by emission spectra in which two peaks are identified under high excitation intensity conditions. The peaks are caused by emission from the ground and excited quantized levels, due to quantum confinement in the plane perpendicular to the nanowire axis. We have identified different energy contributions in the emission spectra, related to the wurtzite structure of the wires, the strain between the wurtzite core and the shell, and the confinement energy of the InAs core. Calculations based on six-band strain-dependent [Formula: see text] theory allow the theoretical estimation of the confined energy states in such materials, and we found these results to be in good agreement with those from the photoluminescence studies.
我们报告了在单个InAs-InP核壳纳米线中量子限制效应的检测。这些纳米线具有直径约为25nm的InAs核，其特征在于发射光谱，在高激发强度条件下可识别出两个峰。这些峰是由于在垂直于纳米线轴的平面内的量子限制，由基态和激发量子化能级的发射引起的。我们已经在发射光谱中识别出了不同的能量贡献，这些贡献与纳米线的纤锌矿结构、纤锌矿核与壳之间的应变以及InAs核的限制能量有关。基于六带应变相关的[公式：见原文]理论的计算允许对这类材料中的受限能量状态进行理论估计，并且我们发现这些结果与光致发光研究的结果非常吻合。
