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[摘要]：A theoretical model has been established to pursue the stability of quantum rings (QRs) and quantum dots (QDs) with respect to thermal effects in the droplet epitaxy. Adding thermal fluctuations to the energetic model within the statistical mechanics frame, we found that a critical temperature provides a means to separate regimes of preferential QR and QD formation. Thermal fluctuations play a crucial role in the temperature-dependent shape evolution. These theoretical results are in good agreement with experiments, which implied that the developed theory can be used to control ring or dot formation in droplet epitaxy. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3702813] |
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