Band structure and Fermi surface of electron-doped C60 monolayers.
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.
Yang
W L
WL
Advanced Light Source (ALS), Materials Science Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA.
Brouet
V
V
Zhou
X J
XJ
Choi
Hyoung J
HJ
Louie
Steven G
SG
Cohen
Marvin L
ML
Kellar
S A
SA
Bogdanov
P V
PV
Lanzara
A
A
Goldoni
A
A
Parmigiani
F
F
Hussain
Z
Z
Shen
Z-X
ZX