Direct spectroscopic evidence for the formation of one-dimensional wetting wires during the growth of InGaAs/GaAs quantum dot chains.
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.
Wang
Xiaoyong
X
Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA. xywang@physics.utexas.edu
Wang
Zhiming M
ZM
Liang
Baolai
B
Salamo
Gregory J
GJ
Shih
Chih-Kang
CK
D001152:Arsenicals / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005708:Gallium / Q000032:analysis / Q000737:chemistry*; D007204:Indium / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D045663:Quantum Dots; D013057:Spectrum Analysis; D017155:Wettability
D001152:Arsenicals; D007204:Indium; C043055:gallium arsenide; D005708:Gallium; C076773:indium arsenide