远低于费米能级的扭结揭示了Fe中新的电子-磁振子散射通道
Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe
摘要：
实际材料的许多性质可以在单粒子图像中使用从头算方法建模。然而，为了精确地理论处理激发态，有必要描述电子-电子关联，包括与玻色子（声子、等离子体激元或磁振子）的相互作用。在这项工作中，通过比较自旋和动量分辨的光电子能谱测量与多体计算进行了一个新的发展的第一性原理方法，我们表明，在铁磁材料的电子带色散扭结可以发生在比预期的更深的结合能（E_b=1.5 eV）。我们表明，所观察到的光谱签名反映了形成的多体状态，其中包括一个光洞绑定到一个相干叠加的重整化自旋翻转激发。这种多体状态的存在为电子-磁振子相互作用的物理学提供了新的线索，这在自旋电子学和铁基超导等领域是必不可少的。
英文摘要：
Many properties of real materials can be modeled using ab initio methods within a single-particle picture. However, for an accurate theoretical treatment of excited states, it is necessary to describe electron-electron correlations including interactions with bosons: phonons, plasmons, or magnons. In this work, by comparing spin- and momentum-resolved photoemission spectroscopy measurements to many-body calculations carried out with a newly developed first-principles method, we show that a kink in the electronic band dispersion of a ferromagnetic material can occur at much deeper binding energies than expected (E_b=1.5 eV). We demonstrate that the observed spectral signature reflects the formation of a many-body state that includes a photohole bound to a coherent superposition of renormalized spin-flip excitations. The existence of such a many-body state sheds new light on the physics of the electron-magnon interaction which is essential in fields such as spintronics and Fe-based superconductivity.
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