轨道诱导的Peierls相变：轨道如何调控晶格不稳定性
Orbital-Induced Peierls Transitions: How Orbitals Orchestrate Lattice Instability
- Waseda University（早稻田大学）
- Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences（俄罗斯科学院乌拉尔分支金属物理研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本综述探讨轨道自由度如何通过电子谱一维化和能带简并消除机制在更高维度诱导Peierls相变，并总结相关材料及高温相特征。
AI中文摘要：
Peierls相变通常被视为一维（1D）材料所固有的现象。然而，轨道自由度即使在更高维度下也能诱导这种不稳定性。主要有两种机制起作用。首先，$p$和$d$轨道的各向异性形状可导致电子谱的有效“一维化”。其次，轨道自由度可通过局域或能带Jahn-Teller效应使能带相对移动，从而消除能带简并，进而影响费米面的嵌套。轨道诱导的Peierls效应最常见于过渡金属周围配体八面体共边连接的情形，而在共面连接几何中则较少见。在本综述中，我们讨论了潜在的物理机制、出现该现象的材料、高温无畸变相的特征，以及分子轨道形成等局域效应的作用。
英文摘要：
The Peierls transition is typically regarded as a phenomenon inherent to one-dimensional (1D) materials. However, orbital degrees of freedom can induce this instability even in higher dimensions. Two mechanisms are primarily responsible. First, the anisotropic shape of $p$ and $d$ orbitals can lead to effective "1D-zation" of the electronic spectrum. Second, orbital degrees of freedom can lift band degeneracy by shifting bands relative to each other via the local or band Jahn-Teller effect, thereby affecting the nesting of the Fermi surface. The orbital-induced Peierls effect is most commonly observed when ligand octahedra surrounding transition metals share edges, and less frequently in face-sharing geometries. In this review, we discuss the underlying physical mechanisms, the materials in which this phenomenon occurs, the characteristics of the high-temperature undistorted phase, and the role of local effects such as the formation of molecular orbitals.
