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Electronic structure of optimally doped pnictide Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub>: a comprehensive angle-resolved photoemission spectroscopy investigation
We have conducted a comprehensive angle-resolved photoemission study on the normal state electronic structure of the Fe-based superconductor Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$. We have identified four dispersive bands which cross the Fermi level and form two hole-like Fermi surfaces around $\Gamma$ and two electron-like Fermi surfaces around M. There are two nearly nested …