直接带隙半导体系统中的磁相互作用

华东师范大学学报(自然科学版) ›› 2012, Vol. 2012 ›› Issue (5): 31-36.

直接带隙半导体系统中的磁相互作用

孙放，唐政

华东师范大学极化材料与器件教育部重点实验室,上海 200241

收稿日期:2011-11-01 修回日期:2012-02-01 出版日期:2012-09-25 发布日期:2012-09-29

Spin interactions in direct-gap semiconductors

SUN Fang, TANG Zheng

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

摘要/Abstract

摘要： 运用精确的量子蒙特卡洛技术，研究了直接带隙半导体系统（Haldane-Anderson模型）中的磁相互作用.精确的数值解揭示了两种截然不同的自旋关联函数，均没有显示出明显的RKKY振荡行为；并且随着不同参数的变化，自旋关联函数呈现相当复杂的多因素控制的显著特征.这些行为对于理解一些磁性的半导体系统会有很大帮助，例如，稀磁半导体等.

关键词: 量子蒙特卡洛, 直接带隙半导体, Haldane-Anderson模型, RKKY

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

中图分类号:

O469

孙放，唐政. 直接带隙半导体系统中的磁相互作用[J]. 华东师范大学学报(自然科学版), 2012, 2012(5): 31-36.

SUN Fang, TANG Zheng. Spin interactions in direct-gap semiconductors[J]. Journal of East China Normal University(Natural Sc, 2012, 2012(5): 31-36.

参考文献

［1］ BAIBICH M N, BROTO J M, FERT A, et al. Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices［J］. Phys Rev Lett, 1988, 61: 2472-2475.

［2］ MAHADEVAN P, ZUNGER A, SARMA D D. Unusual directional dependence of exchange energies in GaAs diluted with Mn: Is the RKKY description relevant?［J］. Phys Rev Lett, 2004, 93: 177201.

［3］ CHAMBERS S. Is it really intrinsic ferromagnetism?［J］, Nature Mater, 2010, 9: 956-957.

［4］ HALDANE F D M, ANDERSON P W. Simple model of multiple charge states of transition-metal impurities in semiconductors［J］. Phys Rev B, 1976, 13: 2553-2559.

［5］ HIRSH J E, FYE R M. Monte Carlo method for magnetic impurities in metals［J］. Phys Rev Lett, 1986, 56: 2521-2524.

［6］ FYE R M, HIRSH J E, SCALAPINO D J. Kondo effect versus indirect exchange in the two-impurities Anderson model: A Monte Carlo study［J］. Phys Rev B, 1987, 35: 4901-4908.

［7］ NARITA A, KASUYA T. Effect of band structure and matrix element on RKKY interaction［J］. J Magn Magn Mater, 1984, 43: 21-42.

［8］ NARITA A. Analytic structures of RKKY interactions in magnetic semiconductors and in materials with a gap on the Fermi surface［J］. J Phys C: Solid State Phys, 1986, 19: 4797-4808.

［9］ LUO M, TANG Z, ZHENG J, et al. First-principles studies of interlayer exchange coupling in (Ga,Mn)As based diluted magnetic semiconductor multilayers［J］. J Appl Phys, 2010, 108: 053703.

［10］ CHUNG J H, CHUNG S J, LEE S, et al. Carrier-mediated antiferromagnetic interlayer exchange coupling in diluted magnetic semiconductor multilayers Ga1-xMnxAs/GaAs: Be［J］. Phys Rev Lett, 2008, 101: 37202.

［11］ DIETL T, OHNO H, MATSUKURA F, et al. Zener model discription of ferromagnetism in Zinc-Blende magnetic semiconductors ［J］. Science, 2000, 287: 1019-1022.

［12］ GEORGES A, KOTLIAR G. Hubbard model in infinite dimensions［J］. Phys Rev B, 1992, 45: 6479-6483.

［13］ OHE J, TOMODA Y, BULUT N, et al. Combined approach of density functional theory and quantum Monte Carlo method to electron correlation in dilute magnetic semiconductors［J］. J Phys Soc Jpn, 2009, 78: 083703.

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