Effect of the sample work function on alkali metal dosing induced electronic structure change

Alkali metal dosing (AMD) has been widely used as a way to control doping without chemical substitution. This technique, in combination with angle resolved photoemission spectroscopy (ARPES), often provides an opportunity observe unexpected phenomena. However, the amount of transferred charge and corresponding change electronic structure vary significantly depending on material. Here, we report study correlation between sample work function alkali induced for three iron-based superconductors: FeSe, Ba(Fe$_{0.94}$Co$_{0.06}$)$_{2}$As$_{2}$ NaFeAs which share similar Fermi surface topology. Electronic upon monolayer were measured by ARPES. Our results show that degree is proportional difference Mulliken's absolute electronegativity dosed metal. finding possible estimate AMD change.