Journal
PHYSICAL REVIEW B
Volume 80, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.241416
Keywords
beryllium; electron-phonon interactions; Fermi surface; photoelectron spectra; surface states
Funding
- NSF
- DMSE of DOE [NSF-DMR-04511632]
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Angle-resolved photoemission reveals that the electron-phonon coupling (EPC) around the circular Fermi contour of the Be(0001) Gamma surface state is strongly anisotropic. The mass enhancement parameter lambda is found to range from values of similar to 1, along high-symmetry directions, to similar to 0.6 in between in stark contrast to the theoretical calculations. Given the simplicity of this system it furnishes an ideal prototype for unraveling the origin of anisotropic EPC in two-dimensional materials.
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