用角分辨光电子能谱研究BaFe $_2$ As $_2$的孪晶和去孪晶能带结构
Detailed band structure of twinned and detwinned BaFe$_2$As$_2$ studied with angle-resolved photoemission spectroscopy
摘要：
利用角分辨光电子能谱（ARPES）研究了BaFe $_2$ As $_2$的孪晶和去孪晶的能带结构。在有序和正常状态下沿四个高对称动量方向$Γ$ /Z-X/Y的测量的组合使我们能够非常详细地识别在有序状态下的复杂的重构能带结构。我们清楚地观察到$d_{xz}$和$d_{yz}$轨道的向列分裂以及由于磁序而导致的折叠，波矢为$(π,π,π)$。我们能够分配所有观察到的波段。特别是，我们建议从以前的报告不同的电子带的分配。高质量的光谱使我们能够实现的能带结构的BaFe $_2$作为$_2$的全面理解。
英文摘要：
We study the band structure of twinned and detwinned BaFe$_2$As$_2$ using angle-resolved photoemission spectroscopy (ARPES). The combination of measurements in the ordered and normal state along four high-symmetry momentum directions $Γ$/Z--X/Y enables us to identify the complex reconstructed band structure in the ordered state in great detail. We clearly observe the nematic splitting of the $d_{xz}$ and $d_{yz}$ orbitals as well as folding due to magnetic order with a wave vector of $(π,π,π)$. We are able to assign all observed bands. In particular we suggest an assignment of the electron bands different from previous reports. The high quality spectra allow us to achieve a comprehensive understanding of the band structure of BaFe$_2$As$_2$.
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