Electronic structures of stacked layers quantum dots: influence of the non-perfect alignment and the applied electric field

doi:10.1088/1674-1056/20/2/027302

Abstract Electronic structures of the artificial molecule comprising two truncated pyramidal quantum dots vertically coupled and embedded in the matrix are theoretically analysed via the finite element method. When the quantum dots are completely aligned, the electron energy levels decrease with the horizontally applied electric field. However, energy levels may have the maxima at non-zero electric field if the dots are staggered by a distance of several nanometers in the same direction of the electric field. In addition to shifting the energy levels, the electric field can also manipulate the electron wavefunctions confined in the quantum dots, in company with the non-perfect alignment.

Keywords: electronic structure quantum dot non-perfect alignment electric field

Received: 10 September 2010
Revised: 25 September 2010
Accepted manuscript online:

PACS:	73.21.La	(Quantum dots)
	73.63.Kv	(Quantum dots)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2009AA03Z405), the National Natural Science Foundation of China (Grant Nos. 60908028 and 60971068), and the Fundamental Research Funds for the Central Universities (Grant No. BUPT2009RC0411).

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Jia Bo-Yong(贾博雍),Yu Zhong-Yuan(俞重远), Liu Yu-Min(刘玉敏), Han Li-Hong(韩利红), Yao Wen-Jie(姚文杰),Feng Hao(冯昊),and Ye Han (叶寒) Electronic structures of stacked layers quantum dots: influence of the non-perfect alignment and the applied electric field 2011 Chin. Phys. B 20 027302

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Electronic structures of stacked layers quantum dots: influence of the non-perfect alignment and the applied electric field

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