title: Direct spectroscopic evidence for the formation of one-dimensional wetting wires during the growth of InGaAs/GaAs quantum dot chains.
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.
authors.affiliation: Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA. xywang@physics.utexas.edu
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Wang
authors.forename: Zhiming M
authors.initials: ZM
authors.lastname: Wang
authors.forename: Baolai
authors.initials: B
authors.lastname: Liang
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Salamo
authors.forename: Chih-Kang
authors.initials: CK
authors.lastname: Shih
mesh_terms: 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
chemical_list: D001152:Arsenicals; D007204:Indium; C043055:gallium arsenide; D005708:Gallium; C076773:indium arsenide