期刊
NANO LETTERS
卷 18, 期 9, 页码 5697-5701出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02295
关键词
Scanning tunneling microscopy; inelastic electron tunneling spectroscopy; graphene; intercalation; density functional theory; nonequilibrium Green function
类别
资金
- Deutsche Forschungsgemeinschaft [KR 2912/10-1, KR 2912/12-1]
- Danish National Research Foundation [DNRF103]
- Villum Fonden [00013340]
- Villum Fonden [00013340] Funding Source: researchfish
Metal-intercalated graphene on Ir(111) exhibits phonon signatures in inelastic electron tunneling spectroscopy with strengths that depend on the intercalant. Extraordinarily strong graphene phonon signals are observed for Cs intercalation. Li intercalation likewise induces clearly discriminable phonon signatures, albeit less pronounced than observed for Cs. The signal can be finely tuned by the alkali metal coverage and gradually disappears upon increasing the junction conductance from tunneling to contact ranges. In contrast to Cs and Li, for Ni-intercalated graphene the phonon signals stay below the detection limit in all transport ranges. Going beyond the conventional two-terminal approach, transport calculations provide a comprehensive understanding of the subtle interplay between the graphene electrode coupling and the observation of graphene phonon spectroscopic signatures.
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