Inelastic electron tunneling into graphene nanostructures on a metal surface

Néel, N.; Steinke, Christina; Wehling, T. O.

doi:10.1103/physrevb.95.161410

Cited by 19 publications

(44 citation statements)

References 24 publications

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“…These changes in d I /d U are assigned to the excitation of out‐of‐plane acoustic (±57 mV) and transverse acoustic as well as out‐of‐plane optical (±77 mV) graphene phonons at the M point of the surface Brillouin zone . Similar observations were previously reported for graphene wrinkles and blisters on Ir(111) …”

Section: Resultssupporting

confidence: 85%

Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

Simon

Voloshina

Tesch

et al. 2018

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The electronic properties of graphene can be efficiently altered upon interaction with the underlying substrate resulting in a dramatic change of charge carrier behavior. Here, the evolution of the local electronic properties of epitaxial graphene on a metal upon the controlled formation of multilayers, which are produced by intercalation of atomic carbon in graphene/Ir(111), is investigated. Using scanning tunneling microscopy and Landau-level spectroscopy, it is shown that for a monolayer and bilayers with small-angle rotations, Landau levels are fully suppressed, indicating that the metal-graphene interaction is largely confined to the first graphene layer. Bilayers with large twist angles as well as twisted trilayers demonstrate a sequence of pronounced Landau levels characteristic for a free-standing graphene monolayer pointing toward an effective decoupling of the top layer from the metal substrate. These findings give evidence for the controlled preparation of epitaxial graphene multilayers with a different degree of decoupling, which represent an ideal platform for future electronic and spintronic applications.

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Section: Resultssupporting

confidence: 85%

Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

Simon

Voloshina

Tesch

et al. 2018

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“…Abrupt increases of g = dI/dV occur at ±56 mV and ±75 mV, which give rise to an enhancement of g with respect to dI/dV at zero bias, g(0), exceeding 200 %. In accordance with previous results reported for graphene wrinkles 12 and with the graphene phonon dispersion on Ir(111) 21 Li are presented in the Supporting Information ( Figure S1). Ni-intercalated graphene does not reveal discernible variations in dI/dV spectra due to phonon excitation.…”

supporting

confidence: 92%

“…Details on sample preparation and experimental methods can be found in the Supporting Information (Section 1). In contrast to previous work, [6][7][8][9][10][11][12][13] graphene-covered Ir(111) intercalated by Cs, Li, Ni represents an all-metal complex in which the graphene-substrate interaction is tailored by the chemical nature and the amount of the intercalant. In addition, the tip-graphene hybridization is finely tuned by controllably changing the tip-graphene separation from tunneling to contact distances.…”

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confidence: 58%

“…and SiO 2 covered with hexagonal boron-nitride. 9,10 Recently, IET signals of graphene phonons have been reported from delaminated graphene nanostructures on Pt(111) 11 and Ir(111) 12 as well as from bilayer graphene on Ir(111). 13 At present, the occurrence of graphene phonon signals in IETS is far from being understood.…”

mentioning

confidence: 99%

“…It seems that nearly free graphene, i. e., a weak graphene-substrate hybridization, favors the conservation of the genuine graphene electronic structure and the concomitant phonon-mediated tunneling. [6][7][8][9][10][11][12][13] However, in some tunneling spectroscopy studies of exfoliated graphene on SiO 2 phonon signatures were not observed. 14,15 Moreover, so far experiments and simulations have solely considered this weak hybridization limit and the coupling between graphene and adjacent electrodes has not been explicitly modeled to date.…”

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confidence: 99%

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

et al. 2018

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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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Scanning Probe Microscopy – From Surfaces to Single Atoms

Néel

2020

Digital Encyclopedia of Applied Physics

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This article highlights the important role of scanning tunneling and atomic force microscopy in modern surface science experiments. Imaging with atomic resolution, manipulation of matter atom by atom, spectroscopy of confined electrons, molecular vibrational quanta, surface phonons, single‐atom spin flips, and single‐molecule fluorescence photons are some of the diverse applications of the microscopes. The impact of the actual atomic or molecular termination of the tip is emphasized. A variety of examples presents the state of the art in quantum physics of surfaces and interfaces and demonstrates that scanning probe techniques significantly contribute to the understanding of matter at the atomic scale.

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Inelastic electron tunneling into graphene nanostructures on a metal surface

Cited by 19 publications

References 24 publications

Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

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

Scanning Probe Microscopy – From Surfaces to Single Atoms

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