摘要
采用推广的LCAO方法和有限元方法计算了两个相同量子点组成的双量子点分子的电子结构 ,结果表明这种人造分子间的相互作用随两个量子点中心之间距离的变化可实现由共价键向离子键的转变 .对于两个不同的量子点组成的双量子点分子 ,利用有限元方法计算了两个量子点中心之间距离、量子点受限势高度以及量子点半径对这种人造分子的电子结构的影响 ,定性地说明了Oosterkamp等人的实验现象 .
We calculated the electronic structure of double quantum-dot molecule with a generalized LCAO approach and the finite element method. Compared with real molecule,the quantum dot molecule can be in the form of covalent bonding or ionic bonding between the two same (or different) quantum dots under different conditions. The condition is related to the distance between the two quantum dots and the energy of each quantum dot. The effects of the potential and radius of the quantum dots on the electronic structure have also been studied with the finite element method.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第2期278-286,共9页
Acta Physica Sinica
关键词
双量子点分子
电子结构
共价键
离子键
quantum-dot molecule
electronic structure
covalent bonding
ionic bonding
