Ultraclean Emission from InAsP Quantum Dots in Defect-Free Wurtzite InP Nanowires
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- 作者：Dan Dalacu ; Khaled Mnaymneh ; Jean Lapointe ; Xiaohua Wu ; Philip J. Poole ; Gabriele Bulgarini ; Val Zwiller ; Michael E. Reimer
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：November 14, 2012
- 年：2012
- 卷：12
- 期：11
- 页码：5919-5923
- 全文大小：285K
- 年卷期：v.12,no.11(November 14, 2012)
- ISSN：1530-6992
文摘
We report on the ultraclean emission from single quantum dots embedded in pure wurtzite nanowires. Using a two-step growth process combining selective-area and vapor鈥搇iquid鈥搒olid epitaxy, we grow defect-free wurtzite InP nanowires with embedded InAsP quantum dots, which are clad to diameters sufficient for waveguiding at 位 950 nm. The absence of nearby traps, at both the nanowire surface and along its length in the vicinity of the quantum dot, manifests in excitonic transitions of high spectral purity. Narrow emission line widths (30 渭eV) and very-pure single photon emission with a probability of multiphoton emission below 1% are achieved, both of which were not possible in previous work where stacking fault densities were significantly higher.