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Direct Spectroscopic Evidence for the Formation of One-Dimensional Wetting Wires During the Growth of InGaAs/GaAs Quantum Dot Chains

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Xiaoyong Wang,*^† Zhiming M. Wang,^‡ Baolai Liang,^‡ Gregory J. Salamo,^‡ and Chih-Kang Shih^†

Department of Physics, the University of Texas at Austin, Austin, Texas 78712, and Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701

Nano Lett., 2006, 6 (9), pp 1847–1851

DOI: 10.1021/nl060271t

Publication Date (Web): August 9, 2006

Section:

Electric Phenomena

Abstract

We report direct spectroscopic evidence for the formation of one-dimensional (1D) wetting wires (WWs) during the Stransky−Krastanov growth of InGaAs/GaAs quantum dot (QD) chains. The wire-like nature of these 1D WWs was demonstrated by their 1D density of states and absorption anisotropies from the photoluminescence excitation measurements. Two groups of QDs were found sitting on top of these 1D WWs and the traditional two-dimensional wetting layers, respectively, with size-dependent emission polarization anisotropies of ca. 6−25% because of their elongated shapes.

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This article has been cited by 3 ACS Journal articles (3 most recent appear below).

Design of Nanostructure Complexes by Droplet Epitaxy
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  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Energy Transfer within Ultralow Density Twin InAs Quantum Dots Grown by Droplet Epitaxy
Bao-Lai Liang, Zhi-Ming Wang, Xiao-Yong Wang, Ji-Hoon Lee, Yuriy I. Mazur, Chih-Kang Shih and Gregory J. Salamo
ACS Nano2008 2 (11), 2219-2224
- Energy Transfer within Ultralow Density Twin InAs Quantum Dots Grown by Droplet Epitaxy
  Bao-Lai Liang, Zhi-Ming Wang, Xiao-Yong Wang, Ji-Hoon Lee, Yuriy I. Mazur, Chih-Kang Shih and Gregory J. Salamo
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  Ultralow density (106/cm2) of twin InAs quantum dot (QD) hybrid structure was grown by a droplet epitaxy technique. The photoluminescence (PL) from ensemble and individual twin InAs QD structures showed a bimodal behavior and an energy transfer between ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Super Low Density InGaAs Semiconductor Ring-Shaped Nanostructures
Jihoon H. Lee, Zhiming M. Wang, Morgan E. Ware, Kushal C. Wijesundara, Mauricio Garrido, Eric. A. Stinaff and Gregory J. Salamo
Crystal Growth & Design2008 8 (6), 1945-1951
- Super Low Density InGaAs Semiconductor Ring-Shaped Nanostructures
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  Crystal Growth & Design2008 8 (6), 1945-1951
  Fabrication of super low density InGaAs semiconductor ring-shaped nanocrystals is demonstrated on a GaAs (100) surface by using molecular beam epitaxy. Specifically, densities down to 2.3 × 106 cm−2 are fabricated with only self-assembled methods based on ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links