Yang W L, Brouet V, Zhou X J, Choi Hyoung J, Louie Steven G, Cohen Marvin L, Kellar S A, Bogdanov P V, Lanzara A, Goldoni A, Parmigiani F, Hussain Z, Shen Z-X
Advanced Light Source (ALS), Materials Science Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA.
Science. 2003 Apr 11;300(5617):303-7. doi: 10.1126/science.1082174.
C60 fullerides are challenging systems because both the electron-phonon and electron-electron interactions are large on the energy scale of the expected narrow band width. We report angle-resolved photoemission data on the band dispersion for an alkali-doped C60 monolayer and a detailed comparison with theory. Compared to the maximum bare theoretical band width of 170 meV, the observed 100-meV dispersion is within the range of renormalization by electron-phonon coupling. This dispersion is only a fraction of the integrated peak width, revealing the importance of many-body effects. Additionally, measurements on the Fermi surface indicate the robustness of the Luttinger theorem even for materials with strong interactions.
