文档介绍：摘要
摘要
采用蒙特卡罗(Monte Carlo)方法研究了单个量子点及准二维量子点阵列的磁特
性。通过探究量子点及其阵列的宏观磁参量,研究其微观磁化行为,从数值模拟的
角度定性地解释实验上已得到的磁性量子点的磁特性。具体工作如下:
1、较为系统的阐述了纳米科技的发展过程;纳米材料的量子效应;量子点的应
用与研究现状。介绍本论文所涉及到的磁性及材料方面的基本理论;阐明本工作所
用到的数值计算方法:蒙特卡罗(Monte Carlo)数值模拟的原理。
2、构建包含不同原子数的单个量子点(球形,简立方晶格结构),采用 Monte
Carlo 数值模拟研究其磁化动力学特性,结果表明,量子点半径、偶极相互作用对单
个量子点的磁特性有重要的影响。
3、构建一种准二维 4×4 量子点阵列,较系统地研究了不同的偶极相互作用和
交换相互作用对体系磁特性的影响。研究表明,交换相互作用、温度对量子点阵磁
特性有重要影响,模拟结果较好地解释了相关实验事实。
4、构建准二维六角结构量子点阵和六角结构磁性原子团两种模型,研究两种模
型下各自的磁化动力学特征,并与人们从实验上得到的结果作比较,发现在一定的
参数下,从准二维六角结构量子点阵模拟得到一定温度下的磁滞回线与实验结果更
为吻合。

关键词磁性量子点 Monte Carlo 模拟相互作用能磁特性
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abstract
Abstract
The ic properties of single quantum dots and quasi two-dimensional quantum
dot arrays have been studied by using standard Monte Carlo simulation method. Also,
microcosmic ization behavior has been investigated by studying macroscopical
ic parameters of single quantum dots and quantum dot arrays. Form the point of
view of numerical simulation we have explained the ic properties of the ic
quantum dots which have been obtained in laboratory. The following items are the
primary work of the thesis.
1st. We have given a systematic discussion on the progress of nanometer science and
technology, quantum effects of nano-material and the applications of quantum dots. Also,
the basic theories of ism and material are introduced. The principle of Monte
Carlo simulation method, a numerical calculation method used in the thesis, is present.
2nd. We constructed single quantum dots (sphericity, single cubic structure), which
contain different number of lattice. ization dynamic properties of the single
quantum dots have been studied by using Monte Carlo simulation method. The results
indicate that the radium of quantum dot (R) and dipole interaction (D) have an important
influence upon the ic properties of single quantum dots.
3rd. We constructed a kind of quasi two-dimensional 4×4 quantum dot arrays.
Systematically, the influe