Semiconductor quantum-wire structures directly grown on high-index surfaces

Structural atomic-scale analysis of GaAs/AlGaAs quantum wires and quantum dots grown by droplet epitaxy on a (311)A substrate

“…The driving force for this elongation is the strong ansitropic nature of the ͑311͒A-surface. 8 In the current case the QD density is so high that the QDs start to coalesce to form QWRs that are oriented along the ͓233͔-direction. In a previous study of QWR formation on an ͑001͒-oriented substrate the achievable QD density was found to be too low to achieve QWRs and as a result quantum dashes were formed instead.…”

“…Traditionally, the techniques used to fabricate QWRs are selective growth on patterned substrates 6 and growth on vicinal 7 or high-index surfaces. 8 Here we report a new technique, the formation of QWRs on ͑311͒A-oriented substrates by thermally induced redistribution and diffusion of constituent atoms of QDs grown by DE. Structural peculiarities of both the QDs and the QWRs are revealed by cross-sectional scanning tunneling microscopy ͑X-STM͒.…”

Comparaison of the Optical Anisotropy of Corrugated and NonCorrugated (311) Superlattices

“…The fundamental translation vectors of reciprocal lattice are: The bisectors plans as shown in figure 1 limit the Brillouin zone along the (0,1,-1) and (3,1,1) directions at the points X and Z . The coordinates of this points are, respectively,…”

“…Among them the GaAs/AlAs (311) superlattices grown by molecular beam epitaxy (MBE) and who have a corrugated interface with gives rise to quantum wire-like structure [2][3][4][5][6][7]. This nanostructure find a great spectrum of technological application in nanoscale electronic and optoelectronic devices : spintronic devices reported very impressive result of optical anisotropy of the In 0.40 Ga 0.60 As grown by MBE on GaAs (311)A and GaAs (331)A substrates.…”

“…Molecular beam epitaxy on high Miller-index surfaces has allowed the achievement of high-quality structures and (311) superlattices are available for experimental investigations of their optical properties. A method made it possible to obtain quantum wires by direct epitaxy of superlattice structures with periodic corrugation of the interface [3]. The breaking up of the (311) surfaces into (311) facets with lower surface energy for certain growth conditions gives rise to these structures.…”