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首页> 外文期刊>Japanese journal of applied physics >Structural stability and electronic properties of 2D alkaline-earth metal silicides, germanides, and stannides
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Structural stability and electronic properties of 2D alkaline-earth metal silicides, germanides, and stannides

机译:2D碱土金属硅化物,锗化和藤硅酸盐的结构稳定性和电子性质

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摘要

We present the results of an extended theoretical study of the structure, phonon, electronic and optical properties of 2D alkaline-earth metal silicides, germanides and stannides (2D Me2X, where Me=Mg, Ca, Sr, Ba and X=Si, Ge, Sn). The performed analysis has shown the occurrence of the pseudo passivation effect and ionic chemical bonding in these 2D Me2X. In addition, the preformed investigation of their phonon spectra has shown the absence of imaginary frequencies indicating the stability of these 2D structures. The band structure calculations performed using the hybrid functional have revealed that all 2D Me2X are semiconductors with the gap varying from 0.12 to 1.01 eV. Among them Mg- and Ca-based 2D materials are direct band-gap semiconductors with the first direct transition having appreciable oscillator strength. We also propose to consider ternary 2D silicides, germanides and stannides with different Me atoms as a feasible way to modify properties of parent 2D Me2X. (c) 2020 The Japan Society of Applied Physics
机译:我们介绍了2D碱土金属硅化物,锗化物和藤硅酸盐的结构,声子,电子和光学性能的扩展理论研究的结果(2D Me2x,其中Me = Mg,Ca,Sr,Ba和X = Si,Ge ,sn)。所进行的分析显示出在这些2D ME2X中发生伪钝化效果和离子化学键合。另外,对其声光谱的预先形成研究表明没有假想频率,指示这些2D结构的稳定性。使用混合函数进行的带结构计算表明,所有2D ME2X都是半导体,间隙从0.12到1.01eV变化。其中,基于MG-和CA的2D材料是具有第一直接过渡的直接带间隙半导体,具有可观的振荡器强度。我们还建议将三元2D硅化物,锗化物和藤硅酸盐与不同的ME原子视为修改父母2D ME2X性质的可行方法。 (c)2020日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2020年第sf期|SF0801.1-SF0801.11|共11页
  • 作者单位

    Belarusian State Univ Informat & Radioelect P Browka 6 Minsk 220013 BELARUS;

    Belarusian State Univ Informat & Radioelect P Browka 6 Minsk 220013 BELARUS|Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Kashirskoe Shosse 31 Moscow 115409 Russia|Belarusian State Univ Inst Nucl Problems Bobruiskaya 11 Minsk 220006 BELARUS;

    Belarusian State Univ Informat & Radioelect P Browka 6 Minsk 220013 BELARUS;

    Belarusian State Univ Informat & Radioelect P Browka 6 Minsk 220013 BELARUS|Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Kashirskoe Shosse 31 Moscow 115409 Russia;

    Royal Inst Technol KTH Dept Mat & Engn Multiscale Mat Modelling SE-10044 Stockholm Sweden|Uppsala Univ Dept Phys & Astron Box 516 SE-75121 Uppsala Sweden;

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