FeSe中强电子-电子相互作用指纹Hubbard带的形成
Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
摘要：
我们使用角分辨光电子能谱（ARPES），探讨在很宽的结合能范围内的FeSe单晶的电子结构，并研究强电子-电子相关的影响。我们提供的证据表明，在高结合能的“Hubbard带”的存在，包括来自Fe $3d$状态的非相干多体激发除了费米能级附近的重整化准粒子带。许多高能量的ARPES观测数据的功能，可以占时，通过动力学平均场论，包括形成一个哈伯德带的谱函数的计算中纳入强局部库仑相互作用的影响。这表明，在几个eV的能量尺度上，由现场库仑排斥和Hund耦合产生的局部关联对于正确理解FeSe和其他相关铁基超导体的电子结构是必不可少的。
英文摘要：
We use angle-resolved photo-emission spectroscopy (ARPES) to explore the electronic structure of single crystals of FeSe over a wide range of binding energies and study the effects of strong electron-electron correlations. We provide evidence for the existence of "Hubbard-like bands" at high binding energies consisting of incoherent many-body excitations originating from Fe $3d$ states in addition to the renormalized quasiparticle bands near the Fermi level. Many high energy features of the observed ARPES data can be accounted for when incorporating effects of strong local Coulomb interactions in calculations of the spectral function via dynamical mean-field theory, including the formation of a Hubbard-like band. This shows that over the energy scale of several eV, local correlations arising from the on-site Coulomb repulsion and Hund's coupling are essential for a proper understanding of the electronic structure of FeSe and other related iron based superconductors.
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