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Understanding and Engineering Phonon-Mediated Tunneling into Graphene on Metal Surfaces

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2018

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Halle, Johannes
Néel, Nicolas
Brandbyge, Mads
Kröger, Jörg

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https://doi.org/10.1021/acs.nanolett.8b02295
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Nano Letters. 2018, 18(9), pp. 5697-5701. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.8b02295

Zusammenfassung

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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530 Physik

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density functional theory; graphene; inelastic electron tunneling spectroscopy; intercalation; nonequilibrium Green function; Scanning tunneling microscopy

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ISO 690HALLE, Johannes, Nicolas NÉEL, Mikhail FONIN, Mads BRANDBYGE, Jörg KRÖGER, 2018. Understanding and Engineering Phonon-Mediated Tunneling into Graphene on Metal Surfaces. In: Nano Letters. 2018, 18(9), pp. 5697-5701. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.8b02295
BibTex
@article{Halle2018-08-01Under-43455,
  year={2018},
  doi={10.1021/acs.nanolett.8b02295},
  title={Understanding and Engineering Phonon-Mediated Tunneling into Graphene on Metal Surfaces},
  number={9},
  volume={18},
  issn={1530-6984},
  journal={Nano Letters},
  pages={5697--5701},
  author={Halle, Johannes and Néel, Nicolas and Fonin, Mikhail and Brandbyge, Mads and Kröger, Jörg}
}
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