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首页> 外文期刊>Physical review >Metal-insulator transition at the LaAlO_3/SrTiO_3 interface revisited: A hybrid functional study
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Metal-insulator transition at the LaAlO_3/SrTiO_3 interface revisited: A hybrid functional study

机译:再探LaAlO_3 / SrTiO_3界面处的金属-绝缘体转变:混合功能研究

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摘要

We investigate the electronic properties of the LaAlO_3/SrTiO_3 interface using density functional theory. In contrast to previous studies, which relied on (semi-)local functionals and the GGA + U method, we here use a recently developed hybrid functional to determine the electronic structure. This approach offers the distinct advantage of accessing both the metallic and insulating multilayers on a parameter-free equal footing. As compared to calculations based on semilocal GGA functionals, our hybrid functional calculations lead to a considerably increased band gap for the insulating systems. The details of the electronic structure show substantial deviations from those obtained by GGA calculations. This casts severe doubts on all previous results based on semilocal functionals. In particular, corrections using rigid band shifts ("scissors operator") cannot lead to valid results.
机译:我们使用密度泛函理论研究了LaAlO_3 / SrTiO_3界面的电子性质。与以前的研究(依赖于(半)局部功能和GGA + U方法)相反,我们在这里使用最近开发的混合功能来确定电子结构。这种方法具有显着的优势,即可以在无参数的基础上访问金属和绝缘多层。与基于半局部GGA泛函的计算相比,我们的混合泛函计算导致绝缘系统的带隙大大增加。电子结构的详细信息显示出与通过GGA计算获得的结果有很大出入。这对基于半局部函数的所有以前的结果提出了严重的怀疑。特别地,使用刚性带移的校正(“剪刀算子”)不能导致有效的结果。

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  • 来源
    《Physical review》 |2013年第4期|045119.1-045119.6|共6页
  • 作者单位

    KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia;

    KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia;

    Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany;

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