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American Institute of Physics, Applied Physics Letters, 14(91), p. 143112

DOI: 10.1063/1.2790483

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Direct imaging of quantum wires nucleated at diatomic steps

Journal article published in 2007 by S. I. Molina ORCID, M. Varela ORCID, D. L. Sales, T. Ben, J. Pizarro, P. L. Galindo ORCID, D. Fuster, Y. Gonzalez, L. Gonzalez, S. J. Pennycook
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This paper is available in a repository.

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Abstract

Atomic steps at growth surfaces are important heterogeneous sources for nucleation of epitaxial nano-objects. In the presence of misfit strain, we show that the nucleation process takes place preferentially at the upper terrace of the step as a result of the local stress relaxation. Evidence for strain-induced nucleation comes from the direct observation by postgrowth, atomic resolution, Z-contrast imaging of an InAs-rich region in a nanowire located on the upper terrace surface of an interfacial diatomic step.