\eb的自旋分裂导带和半金属度的外激励调谐
Spin-Split Conduction band in \eb\ and Tuning of Half-Metallicity with External Stimuli
摘要：
我们报告Eu L3边共振非弹性X射线散射（RIXS）调查EuB6的电子结构。我们观察到，当系统冷却到低于铁磁有序温度并遵循磁序参量时，1.1 eV附近的RIXS光谱权重急剧增加。这种光谱特征归因于从局部4f轨道到相邻位置上的自旋分裂5d轨道的位置间激发，说明了传导电子的交换分裂的重要作用。基于我们的密度泛函理论计算，RIXS数据表明，EuB6在低温下可以一致地描述为半金属电子结构与不完全的自旋极化。我们提出了路线，以实现半金属性EuB6，利用强大的可调谐性的电子结构对栅极电压，应变，和磁场。
英文摘要：
We report Eu L3-edge resonant inelastic x-ray scattering (RIXS) investigation of the electronic structure of EuB6. We observe that the RIXS spectral weight around 1.1 eV increases dramatically when the system is cooled below the ferromagnetic ordering temperature and follows the magnetic order parameter. This spectral feature is attributed to the inter-site excitation from the local 4f orbital to the spin-split 5d orbital on the neighboring site, illustrating the essential role of exchange splitting of the conducting electrons. Based on our density functional theory calculations, the RIXS data suggest that EuB6 at low temperature can be consistently described with a semi-metallic electronic structure with incomplete spin-polarization. We propose routes to achieve half-metallicity in EuB6, which utilize the strong tunability of the electronic structure against gate voltage, strain, and magnetic field.
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