Optical, Structural, and Numerical Investigations of GaAs/AlGaAs Core鈥揗ultishell Nanowire Quantum Well Tubes
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- 作者：Melodie Fickenscher ; Teng Shi ; Howard E. Jackson ; Leigh M. Smith ; Jan M. Yarrison-Rice ; Changlin Zheng ; Peter Miller ; Joanne Etheridge ; Bryan M. Wong ; Qiang Gao ; Shriniwas Deshpande ; Hark Hoe Tan ; Chennupati Jagadish
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：March 13, 2013
- 年：2013
- 卷：13
- 期：3
- 页码：1016-1022
- 全文大小：425K
- 年卷期：v.13,no.3(March 13, 2013)
- ISSN：1530-6992
文摘
The electronic properties of thin, nanometer scale GaAs quantum well tubes embedded inside the AlGaAs shell of a GaAs core鈥搈ultishell nanowire are investigated using optical spectroscopies. Using numerical simulations to model cylindrically and hexagonally symmetric systems, we correlate these electronic properties with structural characterization by aberration-corrected scanning transmission electron microscopy of nanowire cross sections. These tubular quantum wells exhibit extremely high quantum efficiency and intense emission for extremely low submicrowatt excitation powers in both photoluminescence and photoluminescence excitation measurements. Numerical calculations of the confined eigenstates suggest that the electrons and holes in their ground states are confined to extremely localized one-dimensional filaments at the corners of the hexagonal structure which extend along the length of the nanowire.