Singlet-triplet transitions in highly correlated nanowire quantum dots

被引：1

作者：

Chen, Y. T. ^{[1
]}

Chao, C. C. ^{[1
]}

Huang, S. Y. ^{[1
]}

Tang, C. S. ^{[2
]}

Cheng, S. J. ^{[1
]}

机构：

[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan

[2] Natl United Univ, Dept Mech Engn, Lienda 36003, Miaoli, Taiwan

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2010年 / 42卷 / 04期

关键词：

Nanowire quantum dot; Exchange; Correlation; Singlet-triplet transition;

D O I：

10.1016/j.physe.2009.11.084

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We consider a quantum dot embedded in a three-dimensional nanowire with tunable aspect ratio a. A configuration interaction theory is developed to calculate the energy spectra of the finite ID quantum dot systems charged with two electrons in the presence of magnetic fields B along the wire axis. Fruitful singlet-triplet transition behaviors are revealed and explained in terms of the competing exchange interaction, correlation interaction, and spin-Zeeman energy. In the high aspect ratio regime, the singlet-triplet transitions are shown designable by tuning the parameters a and B. The transition also manifest the highly correlated nature of long nanowire quantum dots. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：837 / 840

页数：4

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