Disclosed is a capacitor having a high dielectric constant and low leakage current and a method for fabricating the same, wherein the capacitor may include a first conductive layer, a second conductive layer, a dielectric layer stack between the first conductive layer and the second conductive layer, a dielectric interface layer between the dielectric layer stack and the second conductive layer, and a high work function interface layer between the dielectric interface layer and the second conductive layer.