论文标题
由旋转轨道辅助轨道挫败产生的扁平带
Flat Bands Arising from Spin-Orbit Assisted Orbital Frustration
论文作者
论文摘要
我们介绍了具有平坦乐队的工程和发现周期系统的一般设计原理。我们的范式在晶格上利用了自旋轨道辅助轨道挫败感，以产生带有狭窄分散带的多个带宽比所有其他问题的能量尺度的频带结构，包括围绕平面频段的带隙。我们在具有不同细胞内旋转轨道的各种晶格上呈现一系列模型，例如杂交单位电池中的自由度。作为基于机器学习的详尽搜索的替代方案，这些设计原理和模型可用于在各种物理设置中搜索平面频段系统，并可用于研究系统中相互作用占主导地位在系统的动能量表上占主导地位的系统中弱分散的高度轨道沮丧的自由度的作用。
We present general design principles for engineering and discovering periodic systems with flat bands. Our paradigm exploits spin-orbit assisted orbital frustration on a lattice to produce band structures that contain multiplets of narrowly dispersing bands whose bandwidth is smaller than all other energy scales of the problem including the band gap surrounding the flat bands. We present a series of models in 1D and 2D on various lattices with different intracellular spin-orbit like potentials that hybridize the degrees of freedom in the unit cell. As an alternative to machine learning based exhaustive searches, these design principles and models can be used to search for flat band systems in a variety of physical settings and can be used to investigate the role of weakly dispersing highly orbitally frustrated degrees of freedom in systems where the interactions dominate over the kinetic energy scales of the system.
