The electronic structure of the Na${}_x$CoO${}_2$ surface

D. Pillay, M. D. Johannes, I. I. Mazin

The idea that surface effects may play an important role in suppressing $e_g^{\prime }$ Fermi surface pockets on Na${}_x$CoO${}_2$ $(0.333\le x\le 0.75)$ has been frequently proposed to expla…