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Low-Density Quantum Dot Molecules by Selective Etching Using in Droplet as a Mask
Jihoon Lee,Wang, Z M,Hirono, Y,Dorogan, V G,Mazur, Y I,Eun-Soo Kim,Sang-Mo Koo,Seunghyun Park,Sangmin Song,Salamo, G J IEEE 2011 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.10 No.3
<P>We demonstrate low-density quantum dot molecules (QDMs) by selective etching using In droplets as a mask. Selective etching is performed with InGaAs QDMs buried underneath GaAs capping layer, on which In droplets are formed by droplet epitaxy using molecular beam epitaxy. During the chemical etching, the droplets act as a mask and QDMs underneath the droplets that only survive. Photoluminescence measurement from the selectively etched QDMs in mesa structures shows a much reduced intensity, which indicates low-density QDMs. This technique provides a simple and flexible method to attain low-density QDMs. The density can be easily modified by the control of the size and density of In droplets, which is suitable for single QDM spectroscopy and for their device applications.</P>
Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy
Linares-Garcí,a, Gabriel,Meza-Montes, Lilia,Stinaff, Eric,Alsolamy, S. M.,Ware, M. E.,Mazur, Y. I.,Wang, Z. M.,Lee, Jihoon,Salamo, G. J. Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>Electronic and optical properties of InAs/GaAs nanostructures grown by the droplet epitaxy method are studied. Carrier states were determined by <B>k</B><B>·</B><B>p</B> theory including effects of strain and In gradient concentration for a model geometry. Wavefunctions are highly localized in the dots. Coulomb and exchange interactions are studied and we found the system is in the strong confinement regime. Microphotoluminescence spectra and lifetimes were calculated and compared with measurements performed on a set of quantum rings in a single sample. Some features of spectra are in good agreement.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-016-1518-2) contains supplementary material, which is available to authorized users.</P>