Controlling (In,Ga)As quantum structures on high index GaAs surfaces


We investigate the formation of (In,Ga)As self assembled quantum structures grown on different orientations of a GaAs substrate along one side of the stereographic triangle between (100) and (111)A surfaces. The samples were grown by Molecular Beam Epitaxy, monitored by Reflection High-Energy Electron Diffraction during the growth and characterized by in-situ Scanning Tunneling Microscopy and Atomic Force Microscopy. A systematic transition from zero dimensional (In,Ga)As quantum dots to one dimensional quantum wires was observed as the substrate was varied along the side of the triangle within 25o miscut from the (100) toward (111)A, which includes several high index surfaces. We propose an explanation for the role of the substrate in determining the type of the nanostructure that is formed.

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We would like to acknowledge the support by the NSF Grant Number DMR-0080054. Also, we would like to thank J. L. Shultz for technical assistance.

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Correspondence to Sh. Seydmohamadi.

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Seydmohamadi, S., Wen, H., Wang, Z.M. et al. Controlling (In,Ga)As quantum structures on high index GaAs surfaces. MRS Online Proceedings Library 854, U1.8/JJ1.8/KK1.8 (2004).

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