用ARPES测量Ba（Fe0.92Co0.08）2As 2的轨道分辨寿命
Orbitally resolved lifetimes in Ba(Fe0.92Co0.08)2As2 measured by ARPES
摘要：
尽管许多ARPES调查的铁pnictides，电子口袋的结构仍然知之甚少。通过结合ARPES测量在不同的实验配置，我们清楚地解决他们的椭圆形状。通过与能带计算的比较，确定了dxy轨道的深电子带和dxz/dyz轨道的沿垂直椭圆轴的浅电子带。我们发现，电子和空穴带，与dxy的寿命比dxz/dyz。这表明这两种轨道在电子性质中起着不同的作用，它们的相对权重是决定基态的关键参数。
英文摘要：
Despite many ARPES investigations of iron pnictides, the structure of the electron pockets is still poorly understood. By combining ARPES measurements in different experimental configurations, we clearly resolve their elliptic shape. Comparison with band calculation identify a deep electron band with the dxy orbital and a shallow electron band along the perpendicular ellipse axis with the dxz/dyz orbitals. We find that, for both electron and hole bands, the lifetimes associated with dxy are longer than for dxz/dyz. This suggests that the two types of orbitals play different roles in the electronic properties and that their relative weight is a key parameter to determine the ground state.
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