Fermi surface evolution and Luttinger theorem in Na${}_x$CoO${}_2$: a systematic photoemission study

H. -B. Yang, Z. -H. Pan, A. K. P. Sekharan +9

We report a systematic angle-resolved photoemission study on Na${}_x$CoO${}_2$ for a wide range of Na concentrations ($0.3\le x\le 0.72$). In all the metallic samples at different…