期刊
NANO LETTERS
卷 15, 期 5, 页码 2825-2829出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl504155f
关键词
Graphene; long-range (Coulomb) scattering; short-range scattering; self-energy; angular resolved photoemission spectroscopy
类别
资金
- Emmy-Noether-Program of the Deutsche Forschungsgemeinschaft (DFG)
- Max Planck-UBC Centre for Quantum Materials
- Killam Fellowship
- Alfred P. Sloan Fellowship
- Alexander von Humboldt Fellowship
- NSERC's Steacie Memorial Fellowship
- Canada Research Chairs Program
- NSERC
- CFI
- CIFAR Quantum Materials
Tuning the electronic properties of graphene by adatom deposition unavoidably introduces disorder into the system, which directly affects the single-particle excitations and electrodynamics. Using angle-resolved photoemission spectroscopy (ARPES) we trace the evolution of disorder in graphene by thallium adatom deposition and probe its effect on the electronic structure. We show that the signatures of quasiparticle scattering in the photoemission spectral function can be used to identify thallium adatoms, although charged, as efficient short-range scattering centers. Employing a self-energy model for short-range scattering, we are able to extract a d-like scattering potential delta = -3.2 +/- 1 eV. Therefore, isolated charged scattering centers do not necessarily act just as good long-range (Coulomb) scatterers but can also act as efficient short-range (delta-like) scatterers; in the case of thallium, this happens with almost equal contributions from both mechanisms.
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