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Orbital differentiation in Hund metals

机译：在Hund金属中的轨道分化

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摘要

Orbital differentiation is a common theme in multiorbital systems, yet a complete understanding of it is still missing. Here, we consider a minimal model for orbital differentiation in Hund metals with a highly accurate method: We use the numerical renormalization group as a real-frequency impurity solver for a dynamical mean-field study of three-orbital Hubbard models, where a crystal field shifts one orbital in energy. The individual phases are characterized with dynamic correlation functions and their relation to diverse Kondo temperatures. Upon approaching the orbital-selective Mott transition, we find a strongly suppressed spin coherence scale and uncover the emergence of a singular Fermi liquid and interband doublon-holon excitations. Our theory describes the diverse polarization-driven phenomena in the t(2g) bands of materials such as ruthenates and iron-based superconductors, and our methodological advances pave the way toward real-frequency analyses of strongly correlated materials.
机译：轨道差异是多际系统中的常见主题，但对它的完全理解仍然缺失。在这里，我们考虑了Hund金属中的轨道分化模型，具有高度准确的方法：我们使用数值重整组作为实际频率杂质求解器，用于三轨道的三个轨道喧哗模型的动态平均场研究，其中晶体场转移一个轨道的能量。各个阶段的特征在于动态相关函数及其与多种Kondo温度的关系。在接近轨道选择性的Mott过渡时，我们发现强烈抑制的旋转相干尺度，并揭示了奇异的费米液体的出现和偶然的双击偶尔 - Holon激发。我们的理论描述了诸如钌酸盐和铁基超导体等材料的T（2G）条带中的多样的偏振驱动现象，以及我们的方法实践铺平了朝向强相关材料的实际频率分析。

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  • 来源
    《Physical review》 |2019年第11期|115159.1-115159.10|共10页
  • 作者

    Kugler Fabian B.; Lee Seung-Sup B.; Weichselbaum Andreas; Kotliar Gabriel; von Delft Jan;

  • 作者单位

    Ludwig Maximilians Univ Munchen Arnold Sommerfeld Ctr Theoret Phys Ctr NanoSci D-80333 Munich Germany|Ludwig Maximilians Univ Munchen Munich Ctr Quantum Sci & Technol D-80333 Munich Germany;

    Ludwig Maximilians Univ Munchen Arnold Sommerfeld Ctr Theoret Phys Ctr NanoSci D-80333 Munich Germany|Ludwig Maximilians Univ Munchen Munich Ctr Quantum Sci & Technol D-80333 Munich Germany;

    Ludwig Maximilians Univ Munchen Arnold Sommerfeld Ctr Theoret Phys Ctr NanoSci D-80333 Munich Germany|Ludwig Maximilians Univ Munchen Munich Ctr Quantum Sci & Technol D-80333 Munich Germany|Brookhaven Natl Lab Condensed Matter Phys & Mat Sci Dept Upton NY 11973 USA;

    Brookhaven Natl Lab Condensed Matter Phys & Mat Sci Dept Upton NY 11973 USA|Rutgers State Univ Dept Phys & Astron Piscataway NJ 08854 USA;

    Ludwig Maximilians Univ Munchen Arnold Sommerfeld Ctr Theoret Phys Ctr NanoSci D-80333 Munich Germany|Ludwig Maximilians Univ Munchen Munich Ctr Quantum Sci & Technol D-80333 Munich Germany;

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