LaFeAsO中动量相关的$d_{xz/yz}$带分裂
Momentum dependent $d_{xz/yz}$ band splitting in LaFeAsO
摘要：
我们进行了角分辨光电子能谱（ARPES）的电子结构的LaFeAsO中的α相。在π相中观察到dxz和dyz空穴带在Γ点和M点附近的简并断裂。在Γ点和M点观察到不同的温度依赖的能带分裂行为。在M点附近的能带分裂能量随温度的降低而降低，而在Γ点附近的能带分裂能量几乎没有温度依赖性。通过使用压电装置的去孪晶实验证实了M点附近带移的非线性性质。由于在其它铁基超导体中也观察到了动量相关的分裂行为，我们的观察证实了这种行为在铁基超导体中是普遍存在的。
英文摘要：
We performed angle-resolved photoemission spectroscopy (ARPES) studies of the electronic structure of the nematic phase in LaFeAsO. Degeneracy breaking between the dxz and dyz hole bands near the Γ and M point is observed in the nematic phase. Different temperature dependent band splitting behaviors are observed at the Γ and M points. The energy of the band splitting near the M point decreases as the temperature decreases while it has little temperature dependence near the Γ point. The nematic nature of the band shift near the M point is confirmed through a detwin experiment using a piezo device. Since a momentum dependent splitting behavior has been observed in other iron based superconductors, our observation confirms that the behavior is a universal one among iron based superconductors.
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