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Issue 8, 2014
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Towards controllable growth of self-assembled SiGe single and double quantum dot nanostructures

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Abstract

Fabrication of semiconductor single and double quantum dot (QD) nanostructures is of utmost importance due to their promising applications in the study of advanced cavity quantum electrodynamics, quantum optics and solid-state spin qubits. We present results about the controllable growth of self-assembled single and double SiGe QD arrays with an ultra-low areal density of 1 × 107 cm−2 on nanohole-patterned Si substrates via molecular beam epitaxy. The two dots in a double QD (DQD) aligned along the elongation direction of the nanoholes and show unsymmetrical features in both size and composition due to the asymmetric nanohole profiles after Si buffer layer growth. The interdot spacing between the two dots in a DQD could well be adjusted by changing the elongation ratio of nanoholes. Moreover, whether a single or a double QD formed in a given nanohole was found to be determined by the growth temperature of the Si buffer layer, the reason of which is given by the calculation of the surface chemical potential around the nanoholes after the buffer layer growth.

Graphical abstract: Towards controllable growth of self-assembled SiGe single and double quantum dot nanostructures

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Publication details

The article was received on 06 Aug 2013, accepted on 01 Oct 2013 and first published on 04 Oct 2013


Article type: Paper
DOI: 10.1039/C3NR04114J
Nanoscale, 2014,6, 3941-3948

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    Towards controllable growth of self-assembled SiGe single and double quantum dot nanostructures

    Y. Ma, S. Huang, C. Zeng, T. Zhou, Z. Zhong, T. Zhou, Y. Fan, X. Yang, J. Xia and Z. Jiang, Nanoscale, 2014, 6, 3941
    DOI: 10.1039/C3NR04114J

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