CAJ | 학술논문

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.
기우Monte Carlo모의,연구료준이유4×4양자점진렬중교환상호작용상수J、우겁상호작용상수D、자정각향이성상수K대자선조태화상관자특성적영향.모의결과표명,양자점진렬화단개양자점표현출완전불동적자특성,즉양자점진렬표현위순자성,이단개양자점칙위철자성;분석불동외자장하체계자선조태적변화가이흔호지해석모의결과.
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 inter-action 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 quan-tum dot (SQD) show very different behavior. QDA shows paramagnetic phase,but SQD in QDA shows ferromagnetic phase below Tc. The simulated results may be well explained by analyzing vary of spin con-figuration in difference magnetic field.