Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 4: Physics of quantum rings (Focus session with TT)

HL 4.2: Topical Talk

Montag, 31. März 2014, 10:00–10:30, POT 151

Fabrication of ordered quantum rings — •Zhiming Wang — School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu, 610054 , P. R. China

Quantum rings possess unique properties and have attracted extensive theoretical and experimental attention. Up to now, various effects have been devoted to fabrication of quantum rings via both top-down techniques and self-assembly. Epitaxy has been demonstrated as an effective method to fabricate self-assembled quantum rings. Despite the well-controlled morphology of self-assembled quantum rings produced by using both Stranski-Krastanov growth and droplet epitaxy, the lateral ordering of quantum rings remains challenging[1]. In this presentation, both vertically and laterally aligned quantum rings are described. The fabrication of laterally aligned quantum rings is based on the transformation of ordered quantum dots using the self-organized anisotropic strain engineering technique. The vertically aligned quantum rings are fabricated by multi-step droplet epitaxy. The growth mechanisms of both vertically aligned and laterally ordered quantum rings are discussed. Fabrication of ordered quantum rings is of high priority for practical applications, in particular, as photovoltaic devices and photodetectors.

References

[1] J. Wu and Z. Wang, in: V. M. Fomin (Ed.), Physics of Quantum Rings, Springer, Berlin-Heidelberg, 2014, pp. 143-159.