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Electronic structures of carbides with the rocksalt structure were calculatedby full potential electronic codes solving the Kohn-Sham equation. Bondingcharacters were analyzed by constructing tight-binding Hamiltonian based onmaximally-localized Wannier functions. It was found that the cations in thesecompounds act as an electron provider and the frame is formed by the carbonatoms. The electronic states in the vicinity of the Fermi level are mainly fromthe p-orbitals of C. Pressure and doping are two efficient ways to tune themagnetic and electronic properties of these compounds. It turns out that a spingapless semiconductor can be obtained by applying hydrostatic pressure up totens of gigaPascal. Higher pressure induced an insulator to metal transitionbecause of band broadening. Compounds of IA group (Na, K, Rb, Cs) were magneticsemiconductor at ambient conditions. Alloying with IIA elements decrease themagnetic moment according to the law of $3-x$, where $x$ is the relative atomicratio of the IIA elements to the IA ones. The behaviors of the compounds underthe pressure and the doping effects can be understood by a rigid band model.

Tune of Magnetism and Electronic Structures of Alkali Metal Carbides with Rocksalt Structure