Journal of East China Normal University(Natural Sc ›› 2012, Vol. 2012 ›› Issue (5): 31-36.

• Article • Previous Articles     Next Articles

Spin interactions in direct-gap semiconductors

SUN Fang, TANG Zheng   

  1. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China
  • Received:2011-11-01 Revised:2012-02-01 Online:2012-09-25 Published:2012-09-29

Abstract: This paper studied spin interactions in a direct-gap system with the two-impurity Haldane-Anderson model, by using exact quantum Monte Carlo method. Exact numerical results revealed two types of magnetic correlation functions, and none of them showed clearly RKKY-type oscillatory behavior. Besides, it was observed that magnetic correlation in the system was complicated and multifactor controlled. The complex magnetic behaviors observed in this study would be helpful for understanding the magnetic properties of a gaped system, snch as the dilute magnetic semiconductors.

Key words: quantum Monte Carlo, direct-gap semiconductors, Haldane-Anderson model, RKKY

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