Surface ordering of (In,Ga)As quantum dots controlled by GaAs substrate indexes

Wang, Zh. M.; Seydmohamadi, Sh.; Lee, J. H.; Salamo, G. J.
November 2004
Applied Physics Letters;11/22/2004, Vol. 85 Issue 21, p5031
Academic Journal
Self-organized surface ordering of (In,Ga)As quantum dots in a GaAs matrix was investigated using stacked multiple quantum dot layers prepared by molecular-beam epitaxy. While one-dimensional chain-like ordering is formed on singular and slightly misorientated GaAs(100) surfaces, we report on two-dimensional square-like ordering that appears on GaAs(n11)B, where n is 7, 5, 4, and 3. Using a technique to control surface diffusion, the different ordering patterns are found to result from the competition between anisotropic surface diffusion and anisotropic elastic matrix, a similar mechanism suggested before by Solomon [Appl. Phys. Lett. 84, 2073 (2004)].


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