One- and two-dimensional spectral diffusion of type-II excitons in InP/InAs/InP core-multishell nanowires
One- and two-dimensional spectral diffusion of type-II excitons in InP/InAs/InP core-multishell nanowires
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DOI：
10.1103/physrevb.82.075313
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
Y. Masumoto;K. Goto;Seitaro Yoshida;Y. Sakuma;P. Mohan;J. Motohisa;T. Fukui
中科院分区：
文献类型：
--
作者：
Y. Masumoto;K. Goto;Seitaro Yoshida;Y. Sakuma;P. Mohan;J. Motohisa;T. Fukui
采用时间分辨和光谱分辨的光致发光方法研究了ii型激子在InP/InAs/InP核-多壳纳米线（CMNs）和i型激子在InAs/InP单量子阱（SQW）中的光谱扩散。六边形对称的InP/InAs/InP CMNs由六个面和六个边组成，分别作为二维量子阱和一维量子线。在5k时，ii型激子分两个阶段失去能量。在第一阶段，二维光谱扩散发生在CMNs的ii型量子阱区，类似于InAs/InP SQW中i型激子的光谱扩散。在第二阶段，较慢的一维光谱扩散发生在CMNs的量子线区域。声子介导的激子向低能局域态的迁移导致了二维和一维的光谱扩散。
Spectral diffusion of type-II excitons in InP/InAs/InP core-multishell nanowires (CMNs) and type-I excitons in an InAs/InP single quantum well (SQW) was studied by means of time-resolved and spectrally resolved photoluminescence. InP/InAs/InP CMNs in hexagonal symmetry are made of six facets and six edges which work as two-dimensional quantum wells and one-dimensional quantum wires, respectively. At 5 K type-II excitons lose their energy in two stages. In the first stage, two-dimensional spectral diffusion takes place in the type-II quantum well region in CMNs similar to spectral diffusion of type-I excitons in the InAs/InP SQW. In the second stage, slower one-dimensional spectral diffusion takes place in the quantum wire region in CMNs. Acoustic-phonon-mediated migration of excitons to lower-energy-localized states leads to the spectral diffusion in two dimensions and one dimension.