Time-dependent density functional theory of excitation energies of closed-shell quantum dots

被引：3
|
作者：
Hirose, K
Meir, Y
Wingreen, NS
机构：
[1] NEC Corp Ltd, Fundamental Res Labs, Tsukuba, Ibaraki 3058501, Japan
[2] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[3] NEC Corp Ltd, Labs Amer, Princeton, NJ 08540 USA
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2004年 / 22卷 / 1-3期
关键词：
time-dependent density functional theory; quantum dots; excitation energy;
D O I：
10.1016/j.physe.2003.12.051
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We study the low-energy excitations of two-dimensional elliptical quantum dots with closed-shell structures using time-dependent density functional theory (TDDFT). We find that TDDFT gives fairly accurate results for the low-energy excitations and describes the spin singlet-triplet transition due to the exchange energy. The deviations from exact-diagonalization results are less than 0.20 meV. We show the dependence of excitation energies on the strength of Coulomb interaction and the photoabsorption spectra. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：486 / 489
页数：4
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