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We have performed a systematic photoemission study of the chemical potentialshift as a function of carrier doping in a pnictide system based onBaFe$_2$As$_2$. The experimentally determined chemical potential shift isconsistent with the prediction of a rigid band shift picture by therenormalized first-principle band calculations. This leads to an electron-holeasymmetry (EHA) in the Fermi surface (FS) nesting condition due to differenteffective masses for different FS sheets, which can be calculated from theLindhard function of susceptibility. This built-in EHA from the band structure,which matches well with observed asymmetric superconducting domes in the phasediagram, strongly supports FS near-nesting driven superconductivity in the ironpnictides.

Electron-Hole Asymmetry in Superconductivity of Pnictides Originated from the Observed Rigid Chemical Potential Shift