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Structure and correlation effects in semiconducting SrTiO_3

机译:半导体SrTiO_3的结构和相关效应

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摘要

We have investigated the effects of structure change and electron correlation on SrTiO_3 single crystals using angle-resolved photoemission spectroscopy. We show that the cubic to tetragonal phase transition at 105 K is manifested by a charge transfer from in-plane (d_(yz) and d_(zx)) bands to out-of-plane (d_(xy)) band, which is opposite to the theoretical predictions. Along this second-order phase transition, we find a smooth evolution of the quasiparticle strength and effective masses. The in-plane band exhibits a peak-dip-hump lineshape, indicating a high degree of correlation on a relatively large (170 meV) energy scale, which is attributed to the polaron formation.
机译:我们已经使用角度分辨光发射光谱法研究了结构变化和电子相关性对SrTiO_3单晶的影响。我们表明,在105 K处立方到四方相变由电荷从平面内(d_(yz)和d_(zx))波段转移到平面外(d_(xy))波段来体现,即与理论预测相反。沿着这个二阶相变,我们发现准粒子强度和有效质量的平稳演变。面内谱带呈现峰-峰-峰线形,表明在相对大的(170 meV)能量尺度上具有高度相关性,这归因于极化子的形成。

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  • 来源
    《Physical review》 |2010年第23期|P.235109.1-235109.4|共4页
  • 作者单位

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany;

    rnAdvanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    rnAdvanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Applied Physics, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea;

    Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany;

    rnAdvanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electron density of states and band structure of crystalline solids; photoemission and photoelectron spectra;

    机译:态固体的电子态密度和能带结构;光发射和光电子能谱;

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