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We performed angle-resolved photoemission spectroscopy (ARPES) studies of theelectronic structure of the nematic phase in LaFeAsO. Degeneracy breakingbetween the dxz and dyz hole bands near the {\Gamma} and M point is observed inthe nematic phase. Different temperature dependent band splitting behaviors areobserved at the {\Gamma} and M points. The energy of the band splitting nearthe M point decreases as the temperature decreases while it has littletemperature dependence near the {\Gamma} point. The nematic nature of the bandshift near the M point is confirmed through a detwin experiment using a piezodevice. Since a momentum dependent splitting behavior has been observed inother iron based superconductors, our observation confirms that the behavior isa universal one among iron based superconductors.

Momentum dependent $d_{xz/yz}$ band splitting in LaFeAsO