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

作　　者：贾博雍 俞重远 刘玉敏 韩利红 姚文杰 冯昊 叶寒 

机构地区：[1]Key Laboratory of Information Photonics and Optical Communications (Ministry of Education),Beijing University of Posts and Telecommunications

出　　处：《Chinese Physics B》2011年第2期448-452,共5页中国物理B（英文版）

基　　金：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);the Fundamental Research Funds for the Central Universities (Grant No. BUPT2009RC0411)

摘　　要：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.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.

关 键 词：electronic structure quantum dot non-perfect alignment electric field 

分 类 号：O471.1[理学—半导体物理]