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中国科学院大学学报 ›› 2008, Vol. 25 ›› Issue (2): 167-171.DOI: 10.7523/j.issn.2095-6134.2008.2.004

• 论文 • 上一篇    下一篇

交换关联势对PbS晶格常数和能带结构影响的第一性原理研究

邢怀中丁宗玲黄燕梁二军陈效双   

  1. 1东华大学应用物理系,上海201620

    2中国科学院上海技术物理研究所,红外物理国家重点实验室,上海200083

  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-03-15

Firstprinciplestudyforeffectofexchangecorrelation potentialonlatticeparameterandbandstructureofPbS

XINGHuai Zhong1;DINGZongLing1;HUANGYan2;

LIANGEr Jun1;CHENXiao Shuang

  

  1. 1DepartmentofAppliedPhysics,DonghuaUniversity,Shanghai201620,China

    2NationalLab.ofInfraredPhysics,ShanghaiInstituteforTechnicalPhysics,ChineseAcademyofSciences,Shanghai200083,China

  • Received:1900-01-01 Revised:1900-01-01 Published:2008-03-15

摘要: 基于第一性原理总能量平面波全势方法,采用广义梯度近似(GGA)和局域密度近似(LDA)等不同的交换关联势,计算了体心结构PbS的总能,并给出了体系平衡时的晶格常数.讨论了不同交换关联势对能带结构、态密度、分态密度及能隙的影响.与面心结构PbS结果对比,能量的计算结果表明,面心结构PbS较体心结构更稳定.另外,体心结构PbS的能带计算结果表明存在能隙,这与同族铅盐化合物中存在能隙的实验结论一致.上述PbS的计算结果有助于实验研究.

关键词: 交换关联势, 态密度, 能带结构, PbS

Abstract: Basedonthefullpotentiallinearizedplanewavemethodoffirstprinciple,thecalculationsofthetotal energyandtheequilibriumlatticeconstantforthebodycenteredcubic(bcc)PbScompoundhavebeenperformed withindifferentexchangecorrelationpotentials(DECP)onboththegeneralizedgradientapproximation(GGA)and thelocaldensityapproximation(LDA).TheeffectofDECPonthebandstructure,thedensityofstates,thepartial densityofstatesandthebandgaparediscussed,respectively.Theenergycalculationshowsthatthefacecentered cubicstructureisfoundtobethemorestableonethanthatofthebccstructure.Inaddition,bandstructure calculationsinthebccstructureshowabandgapexistence,whichagreeswellwithexperimentalresultsofotherPb chalcogenidecompound(PbTe).TheaboveresultofPbS(bcc)ishelpfultotheexperimentalstudyinthefuture.

Key words: exchangecorrelationpotential, densityofstate, bandstructure, PbS

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