Substrate-dependent plasmonic properties of supported graphene

Cupolillo, A.; Politano, Antonio; Ligato, Nadia; Perez, Denia Cid; Chiarello, G.; Caputi, Lorenzo

doi:10.1016/j.susc.2014.11.002

Cited by 20 publications

(13 citation statements)

References 72 publications

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“…Obviously, the main source of the disagreement between the theory and experiment can be the presence of the SiC (0001) substrate in the latter and the absence thereof in the former. The substrate may cause additional screening leading to the shift of plasmon peaks and change the dispersion law [20][21][22][23]. Moreover, the interaction of graphene with a substrate can cause the deformation of the graphene sheet, leading to the confinement of the plasmon oscillations between the ripples [24].…”

Section: Results Of Calculations and Discussionmentioning

confidence: 99%

Electronic excitations in quasi-2D crystals: what theoretical quantities are relevant to experiment?

Nazarov

2015

New J. Phys.

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View the article online for updates and enhancements. Related contentToward a novel theoretical approach for determining the nature of electronic excitations in quasi-two-dimensional systems A Politano, G Chiarello and A Cupolillo -Low-energy dielectric screening in Pd and PdHx systems V M Silkin, V U Nazarov, I P Chernov et al.Acoustic plasmons in extrinsic freestanding graphene M Pisarra, A Sindona, P Riccardi et al. AbstractThe ab initio theory of electronic excitations in atomically thin (quasi-two-dimensional (Q2D)) crystals presents extra challenges in comparison to both the bulk and purely 2D cases. We argue that the conventionally used energy-loss function Im(where q , ϵ , and ω are the dielectric function, the momentum, and the energy transfer, respectively) is not, generally speaking, the suitable quantity for the interpretation of the electron-energy loss spectroscopy (EELS) in the Q2D case, and we construct different functions pertinent to the EELS experiments on Q2D crystals. Secondly, we emphasize the importance and develop a convenient procedure of the elimination of the spurious inter-layer interaction inherent to the use of the 3D super-cell method for the calculation of excitations in Q2D crystals. Thirdly, we resolve the existing controversy in the interpretation of the so-called π and π σ + excitations in monolayer graphene by demonstrating that both dispersive collective excitations (plasmons) and non-dispersive single-particle (inter-band) transitions fall in the same energy ranges, where they strongly influence each other.

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Section: Results Of Calculations and Discussionmentioning

confidence: 99%

Electronic excitations in quasi-2D crystals: what theoretical quantities are relevant to experiment?

Nazarov

2015

New J. Phys.

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“…Conversely, the UV plasmonic response of graphene is dominated by a peak termed p plasmon, originated by electronic transitions involving p and p* bands [22]. This mode disperses with momentum in the range between 4 and 7 eV, depending on the substrate [28,29,39].…”

Section: Introductionmentioning

confidence: 99%

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Politano

Radović

Borka

et al. 2016

Carbon

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“…Plasmons are quantized oscillations of the valence electron density in metals, metal-dielectric interfaces and nanostructures, being usually excited by light or electronbeam radiation. Plasmon-related technologies are expected to receive a burst from nanocarbon architectures [1-10], due to one of the fascinating features of monolayer graphene (MG) [11], i.e., its extrinsic plasmon modes at terahertz (THz) frequencies [12][13][14][15][16][17][18][19][20]. These show much stronger confinement, larger tunability and lower losses [21] compared to conventional plasmonic materials, such as silver or gold.…”

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confidence: 99%

Plasmon Modes of Graphene Nanoribbons with Periodic Planar Arrangements

et al. 2016

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Among their amazing properties, graphene and related low-dimensional materials show quantized charge-density fluctuations-known as plasmons-when exposed to photons or electrons of suitable energies. Graphene nanoribbons offer an enhanced tunability of these resonant modes, due to their geometrically controllable band gaps. The formidable effort made over recent years in developing graphene-based technologies is however weakened by a lack of predictive modeling approaches that draw upon available ab initio methods. An example of such a framework is presented here, focusing on narrow-width graphene nanoribbons organized in periodic planar arrays. Time-dependent density-functional calculations reveal unprecedented plasmon modes of different nature at visible to infrared energies. Specifically, semimetallic (zigzag) nanoribbons display an intraband plasmon following the energy-momentum dispersion of a two-dimensional electron gas. Semiconducting (armchair) nanoribbons are instead characterized by two distinct intraband and interband plasmons, whose fascinating interplay is extremely responsive to either injection of charge carriers or increase in electronic temperature. These oscillations share some common trends with recent nanoinfrared imaging of confined edge and surface plasmon modes detected in graphene nanoribbons of 100-500 nm width. Plasmons are quantized oscillations of the valence electron density in metals, metal-dielectric interfaces and nanostructures, being usually excited by light or electronbeam radiation. Plasmon-related technologies are expected to receive a burst from nanocarbon architectures [1-10], due to one of the fascinating features of monolayer graphene (MG) [11], i.e., its extrinsic plasmon modes at terahertz (THz) frequencies [12][13][14][15][16][17][18][19][20]. These show much stronger confinement, larger tunability and lower losses [21] compared to conventional plasmonic materials, such as silver or gold. Nowadays plasmons are launched, controlled, manipulated and detected in a variety of graphene-related materials and heterostructures, which suggests that graphene-based plasmonic devices are becoming closer to reality, with the potential to operate on the "THz gap", forbidden by either classical electronics or photonics [4,22,23]. Plasmons with widely tunable frequencies have been observed in graphene nanoribbons (GNRs)-from the nano-to microrange in width [12,14,24,25]. On the theoretical side, density functional and tight-binding (TB) approaches have explored the electronic structure of zigzag and armchair GNRs, with particular attention to the band-gap values of the intrinsic systems, being a major control factor of their plasmonic properties [26][27][28][29][30]. Far fewer studies have been focused on plasmon resonances in GNRs using either a semiclassical electromagnetic picture [31] or a TB scheme [5,32,33], and specializing to THz frequencies. A comprehensive characterization of the dielectric properties of such systems is, however, lacking.Here, we provide an ab initio study o...

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Substrate-dependent plasmonic properties of supported graphene

Cited by 20 publications

References 72 publications

Electronic excitations in quasi-2D crystals: what theoretical quantities are relevant to experiment?

Electronic excitations in quasi-2D crystals: what theoretical quantities are relevant to experiment?

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Plasmon Modes of Graphene Nanoribbons with Periodic Planar Arrangements

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