Symmetry in the diagonal self-assembled InAs quantum wire arrays on InP substrate

Diagonal self-assembled InAs quantum wire (QWR) arrays with the stacked InAs/In0.52Al0.48As structure are grown on InP substrates, which are (001)-oriented and misoriented by 6degrees towards the [100] direction. Both the molecular beam epitaxy (MBE) and migration enhanced epitaxy (MEE) techniques are employed. Transmission electron microscopy reveals that whether a diagonal InAs QWR array of the stacked InAs/InAlAs is symmetrical about the growth direction or not depends on the growth method as well as substrate orientation. Asymmetry in the diagonal MEE-grown InAs QWR array can be ascribed to the influence of surface reconstruction on upward migration of adatoms during the self-assembly of the InAs quantum wires.

Diagonal self-assembled InAs quantum wire (QWR) arrays with the stacked InAs/In0.52Al0.48As structure are grown on InP substrates, which are (001)-oriented and misoriented by 6degrees towards the [100] direction. Both the molecular beam epitaxy (MBE) and migration enhanced epitaxy (MEE) techniques are employed. Transmission electron microscopy reveals that whether a diagonal InAs QWR array of the stacked InAs/InAlAs is symmetrical about the growth direction or not depends on the growth method as well as substrate orientation. Asymmetry in the diagonal MEE-grown InAs QWR array can be ascribed to the influence of surface reconstruction on upward migration of adatoms during the self-assembly of the InAs quantum wires.

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Chinese Mat Res Soc.; Minist Sci & Technol China.; Natl Nat Sci Fdn China.; Chinese Acad Sci.; Chinese Acad Engn.; Gove Shaanxi Province & Xian City.; China Electr Mat Assoc.; China Assoc Sci & Technol.

Chinese Acad Sci, Inst Semicond, Lab Semicond Mat Sci, Beijing 100083, Peoples R China; Chinese Acad Sci, Inst Semicond, Ctr Semicond Mat, Beijing 100083, Peoples R China

Chinese Mat Res Soc.; Minist Sci & Technol China.; Natl Nat Sci Fdn China.; Chinese Acad Sci.; Chinese Acad Engn.; Gove Shaanxi Province & Xian City.; China Electr Mat Assoc.; China Assoc Sci & Technol.