Image-potential states of graphene on noble-metal surfaces

Nobis, David; Potenz, Marco; Niesner, Daniel; Fauster, Thomas

doi:10.1103/physrevb.88.195435

Cited by 34 publications

(61 citation statements)

References 79 publications

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“…This is because single-layer graphene is a stronger light absorber compared to the 0.5-nm-thick ZnPc [35]. The weak 2PPE signal from bare graphene is also consistent with previous measurements done with graphene on single-crystal metals in which only the IPS is observed [53]. Therefore, we can safely assume that the 2PPE signal from the ultrathin ZnPc samples is mainly originated from the ZnPc molecules.…”

Section: B Ultrafast Charge-transfer Dynamicssupporting

confidence: 77%

Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

Wang

Caraiani

et al. 2015

Phys. Rev. Applied

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Graphene is used as flexible electrodes in various optoelectronic devices. In these applications, ultrafast charge transfer from semiconducting light absorbers to graphene can impact the overall device performance. Here, we propose a mechanism in which the charge-transfer rate can be controlled by varying the number of graphene layers and their stacking. Using an organic semiconducting molecule as a light absorber, the charge-transfer rate to graphene is measured by using time-resolved photoemission spectroscopy. Compared to graphite, the charge transfer to monolayer graphene is about 2 times slower. Surprisingly, the charge transfer to A-B-stacked bilayer graphene is slower than that to both monolayer graphene and graphite. This anomalous behavior disappears when the two graphene layers are randomly stacked. The observation is explained by a charge-transfer model that accounts for the band-structure difference in mono-and bilayer graphene, which predicts that the charge-transfer rate depends nonintuitively on both the layer number and stacking of graphene.

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Section: B Ultrafast Charge-transfer Dynamicssupporting

confidence: 77%

Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

Wang

Caraiani

et al. 2015

Phys. Rev. Applied

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“…For example, transition-metals such as Cu provide an excellent opportunity to grow wafer-size graphene that can be transferred onto insulating substrates 1 , which has potential applications such as flexible displays 2 and transparent electrodes 3 . In addition, ferromagnetic substrates such as Co result in a mini Dirac cone that consists of single spin, which originates from the hybridization between graphene π and Co 5d bands 4 .…”

Section: Introductionmentioning

confidence: 99%

Hole doping, hybridization gaps, and electronic correlation in graphene on a platinum substrate

Hwang

Kim

et al. 2017

Nanoscale

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The interaction between graphene and substrates provides a viable routes to enhance functionality of both materials. Depending on the nature of electronic interaction at the interface, the electron band structure of graphene is strongly influenced, allowing us to make use the intrinsic properties of graphene or to design additional functionality in graphene. Here, we present an angle-resolved photoemission study on the interaction between graphene and a platinum substrate. The formation of an interface between graphene and platinum leads to a strong deviation in the electronic structure of graphene not only from its freestanding form but also from the behavior observed on typical metals. The combined study on the experimental and theoretical electron band structure unveils the unique electronic properties of graphene on a platinum substrate, which singles out graphene/platinum as a model system investigating graphene on a metallic substrate with strong interaction.

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“…13 Recently, the surface states and electronic structure of graphene on a number of metal substrates have been studied using photoemission spectroscopy. [14][15][16][17] Scanning tunneling microscopy (STM) and spectroscopy (STS) studies provide a complementary viewpoint as a local probe sensitive to both occupied and unoccupied electronic states. In these experiments local topographical images provide structural information of measured sites, and local spectroscopy avoids the complexity of aggregated rotational domains.…”

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confidence: 99%

Modification of electronic surface states by graphene islands on Cu(111)

et al. 2015

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We present a study of graphene/substrate interactions on UHV-grown graphene islands with minimal surface contamination using \emph{in situ} low-temperature scanning tunneling microscopy (STM). We compare the physical and electronic structure of the sample surface with atomic spatial resolution on graphene islands versus regions of bare Cu(111) substrate. We find that the Rydberg-like series of image potential states is shifted toward lower energy over the graphene islands relative to Cu(111), indicating a decrease in the local work function, and the resonances have a much smaller linewidth, indicating reduced coupling to the bulk. In addition, we show the dispersion of the occupied Cu(111) Shockley surface state is influenced by the graphene layer, and both the band edge and effective mass are shifted relative to bare Cu(111).Comment: 12 pages, 3 figure

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Image-potential states of graphene on noble-metal surfaces

Cited by 34 publications

References 79 publications

Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

Effect of Interlayer Coupling on Ultrafast Charge Transfer from Semiconducting Molecules to Mono- and Bilayer Graphene

Hole doping, hybridization gaps, and electronic correlation in graphene on a platinum substrate

Modification of electronic surface states by graphene islands on Cu(111)

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