准二维4×4量子点磁化动力学特性的Monte Carlo模拟(英文)  

Magnetic dynamic properties for quasi-two-dimensional 4×4 quantum dots:Monte Carlo simulation

作　　者：叶晴莹[1] 陈水源[1,2] 蒋丽钦[1] 杨艳敏[1] 林枝钦[1] 黄志高[1] 

机构地区：[1]福建师范大学物理系,福州350007 [2]南京大学固体微结构国家实验室,南京210093

出　　处：《功能材料与器件学报》2009年第3期290-294,共5页Journal of Functional Materials and Devices

基　　金：National Nature Science Foundation(No.60676055);National Key Project for Basic Research(No.2005CB623605);Nature Science Foundation and Educational Office Foundation of Fujian Province(No.E0320002 and JB08062)

摘　　要：基于Monte Carlo模拟,研究了准二维4×4量子点阵列中交换相互作用常数J、偶极相互作用常数D、磁晶各向异性常数K对自旋组态和相关磁特性的影响。模拟结果表明,量子点阵列和单个量子点表现出完全不同的磁特性,即量子点阵列表现为顺磁性,而单个量子点则为铁磁性;分析不同外磁场下体系自旋组态的变化可以很好地解释模拟结果。In this paper, an in - plane quasi two - dimensional 4 × 4 quantum dot array （QDA） has been considered. Base on Monte Carlo simulation, the effect of exchange interaction constant J, dipolar interaction constant D, magnetic anisotropy constant K on spin configuration and magnetic properties of QDA have been studied. The simulated results indicate that the magnetization curves of QDA and single quantum dot （SQD） show very different behavior. QDA shows paramagnetic phase, but SQD in QDA shows ferromagnetic phase below Te. The simulated results may be well explained by analyzing vary of spin configuration in difference magnetic field.

关 键 词：磁性量子点 MONTE CARLO模拟 磁特性 

分 类 号：O482.15[理学—固体物理]