第41卷第4期2024年8月J.At.Mol.Phys.,2024,41:046001(9pp)原子与分子物理学报JOURNALOFATOMICANDMOLECULARPHYSICS碱土金属X(X=Be,Mg,Ca和Sr)掺杂二维SnS,材料的第一性原理研究Vol.41No.4Aug.2024柏慧,梁前,钱国林,谢泉(贵州大学大数据与信息工程学院新型光电子材料与技术研究所,贵阳550025)摘要:基于密度泛函理论的第一性原理研究质势平面波方法,计算了碱土金属X(X=Be,Mg,Ca和Sr)掺杂二维单层SnS,的电子结构、磁学性质和光学性质,结果表明:S-rich条件下的体系相较于Sn-rich更稳定,能带结构表明:在Be掺杂后,SnS,体系从自旋向上通道和自旋向下通道完全对称的非磁性半导体转变为具有1.999μ磁矩的磁性半导体,在Mg掺杂后,体系转变为非磁性P型半导体;Ca和Sr两种掺杂体系由于极化程度的不同,导致在下自旋通道的能带穿过费米能级,而在上自旋通道的能带并未穿过费米能级,呈现出磁矩分别为1.973、2.000μg的半金属特性.同时发现X(X=Be,Mg,Ca和Sr)掺杂后,掺杂体系实部静态介电常数大幅度增加,掺杂后的SnS,体系的极化能力增强,虚部数值在低能区明显变大,更适用于长波长光电器,Be,Mg,Ca和Sr掺杂不仅导致吸收边红移,而且提高了红外光区域的有效利用率.关键词:二维SnSz;电子结构;磁性;光学性质中图分类号:0471First-principlesstudyofalkalineearthmetalX(X=Be,Mg,CaandSr)文献标识码:Adopedtwo-dimensionalSnS,materialsDO1I:10.19855/j.1000-0364.2024.046001BAIHui,LIANGQian,QIANGuo-Lin,XIEQuan(InstituteofAdvancedOptoelectronicMaterialsandTechnology,CollegeofBigDataandInformationEngineering,GuizhouUniversity,Guiyang550025,China)Abstract:Basedonthefirst-principlesstudyofpseudopotentialplanewavemethod,theelectronicstructures,magneticpropertiesandopticalpropertiesofalkalineearthmetalX(X=Be,Mg,CaandSr)dopedtwo-di-mensional(2D)SnS,monolayerswerecalculated.TheresultsshowthatthesystemsunderS-richconditionaremorestablethanthoseunderSn-richone,andtheCaandSrdopedsystemshavethesmallestformationener-giesofrespectively-2.674eVand-2.422eVunderS-richcondition.ThebandstructuresshowthatafterBedoping,theimpuritylevelsappearinthespin-downchannelneartheFermilevel,whichleadtothetransi-tionoftheSnS2systemfromacompletelysymmetricnon-magneticsemiconductortoamagneticsemiconduct...