Fig. 2From: Alkali-metal-adsorbed g-GaN monolayer: ultralow work functions and optical propertiesBand structures for pristine and alkali-metal-adsorbed g-GaN: a pristine g-GaN, b Li-adsorbed g-GaN, c Na-adsorbed g-GaN, d K-adsorbed g-GaN, e Rb-adsorbed g-GaN, and f Cs-adsorbed g-GaN. The Fermi level is denoted by green dashed linesBack to article page