phonon dynamics of graphene on metals - iopscience

Thermal Conductivity of Graphene and Graphite:

We characterize the thermal conductivity of graphite, monolayer graphene, graphane, fluorographane, and bilayer graphene, solving exactly the Boltzmann transport equation for phonons, with phonon–phonon collision rates obtained from density functional perturbation theory. For graphite, the results are found to be in excellent agreement with experiments; notably, the thermal conductivity is

Thermal properties of graphene: Fundamentals and

2012/11/23(a) Schematic of the atomic arrangement in graphene sheets. Dashed lines in the bottom sheet represent the outline of the unit cell. The areal density of carbon atoms in graphene is 3.82 1015 cm −2. (b) Graphene phonon dispersion along the Γ-to-M crystallographic direction.4 –7 Lines show numerical calculations; symbols represent experimental data.

[PDF] The phonon dispersion of graphite revisited

Phonon dynamics of graphene on metals A. Taleb 2016 View 3 excerpts, cites background and results Save Alert Research Feed Vibrational modes and low-temperature thermal properties of graphene and carbon nanotubes: Minimal force-constant model,, 98

Ultrafast nonequilibrium carrier dynamics in a single

Nonequilibrium carrier dynamics in single exfoliated graphene layers on muscovite substrates are studied by ultrafast optical pump-probe spectroscopy and compared with microscopic theory. The very high 10-fs-time resolution allows for mapping the ultrafast carrier equilibration into a quasi-Fermi distribution and the subsequent slower relaxation stages. Coulomb-mediated carrier-carrier and

Graphene

Graphene (/ ˈ ɡ r f iː n / [1]) is an allotrope of carbon consisting of a single layer of atoms arranged in a two-dimensional honeycomb lattice. [2] [3] The name is a portmanteau of graphite and the suffix -ene, reflecting the fact that the graphite allotrope of carbon consists of stacked graphene layers.

Effect of oxidation degree on the thermal properties of

2020/11/1Phonon transport in the functionalized graphene sheet at a high oxidation level is governed by the phonon mean free path associated with phonon-defect scattering. Oxygen-containing functional groups adversely influence the thermal properties due to enhanced phonon-scattering arising from the increased number of phonon-scattering centers.

Thermal properties of graphene and few‐layer graphene:

graphene layers can be explained by the intrinsic properties described by phonon–phonon scattering [43]. The increase in the number of graphene layers leads to the changes in the phonon dispersion, and results in more phonon states available for Umklapp

[PDF] Nanoscale surface dynamics of Bi2Te3(111):

Phonon dynamics of graphene on metals. A. Al Taleb, D. Faras Physics, Medicine Journal of physics. Condensed matter : an Institute of Physics journal 2016 43 Save Alert Research Feed Surface lattice vibration and electron-phonon interaction in topological

[PDF] Nanoscale surface dynamics of Bi2Te3(111):

Phonon dynamics of graphene on metals. A. Al Taleb, D. Faras Physics, Medicine Journal of physics. Condensed matter : an Institute of Physics journal 2016 43 Save Alert Research Feed Surface lattice vibration and electron-phonon interaction in topological

Ultra

2018/11/1A thermoelectric material consisting of Cu 2 Se incorporated with up to 0.45 wt% of graphene nanoplates is reported. The carbon-reinforced Cu 2 Se exhibits an ultra-high thermoelectric figure-of-merit of zT = 2.44 0.25 at 870 K. Microstructural characterization reveals dense, nanostructured grains of Cu 2 Se with multilayer-graphene and graphite agglomerations located at

[PDF] Nanoscale surface dynamics of Bi2Te3(111):

Phonon dynamics of graphene on metals. A. Al Taleb, D. Faras Physics, Medicine Journal of physics. Condensed matter : an Institute of Physics journal 2016 43 Save Alert Research Feed Surface lattice vibration and electron-phonon interaction in topological

Direct determination of mode

Fig. 2 Electron dynamics measured by TR-ARPES in graphite. (A) The experimental setup, along with the 2D-projected Brillouin zone of graphite.Blue (purple) circle indicates the range of momenta accessible to 6-eV (25-eV) photons. We measure along the Γ − K

Understanding and Engineering Phonon

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

Signature of the electron

Due to its peculiar cone-shaped bandstructure, the electron-phonon contribution to the electron self-energy of graphene shows qualitative differences as compared to the case of ordinary bulk metals. The spectral function of graphene has been measured with high energy and momentum resolution by angle-resolved photoelectron spectroscopy.

Nonequilibrium electron dynamics in pump

[6–9], graphene [10,11], and other two-dimensional (2D) materials [12,13]. In these experiments, one of the common highlighted the importance of the phonon dynamics during the relaxation toward equilibrium [37]. When the phonon dynam-ics are taken into

Breakdown of the adiabatic Born

The use of ABO to describe lattice motion in metals is, therefore, questionable. In spite of this, ABO has proved effective for the accurate determination of chemical reactions, molecular dynamics and phonon frequencies in a wide range of metallic systems.

Ultralow Thermal Conductivity and Thermal Diffusivity

The frequency of phonons in graphene is much higher than that in metals. The maximum phonon frequencies in Au, Pd and Ni are 4.7, 6.6, 9.6 THz, respectively, substantially lower than that in graphene (50 THz).The low-energy phonon modes in graphene with

'Decorated' graphene is a superconductor – Physics World

It was then realized that such electron–phonon coupling might occur not just in bulk graphite compounds but also by depositing atoms of a suitable element on to single layers of graphene. In 2012 Gianni Profeta of the University of L'Aquila in Italy and colleagues used computer modelling to predict that lithium ought to be a particularly good candidate for such doping.

Phonon dynamics of graphene on metals

2016/2/18In such cases, phonon dispersion curves are especially important to learn about the Gr-substrate dynamics. First HREELS investigations of the phonon dispersion of supported Gr were performed by Oshima and coworkers [ 35 – 37 ] and by the Rieder group [ 38 – 40 ] in the 1990s.

Phys. Rev. B 81, 045419 (2010)

We calculate the effect of the electron-phonon interaction on the electronic density of states (DOS), the quasiparticle properties, and on the optical conductivity of graphene. In metals with DOS constant on the scale of phonon energies, the electron-phonon renormalizations drop out of the dressed DOS, however, due to the Dirac nature of the electron dynamics in graphene, the band DOS is

Graphene

Graphene (/ ˈ ɡ r f iː n / [1]) is an allotrope of carbon consisting of a single layer of atoms arranged in a two-dimensional honeycomb lattice. [2] [3] The name is a portmanteau of graphite and the suffix -ene, reflecting the fact that the graphite allotrope of carbon consists of stacked graphene layers.

Nonequilibrium electron dynamics in pump

[6–9], graphene [10,11], and other two-dimensional (2D) materials [12,13]. In these experiments, one of the common highlighted the importance of the phonon dynamics during the relaxation toward equilibrium [37]. When the phonon dynam-ics are taken into

Graphene on Metallic Substrates: Suppression of the

The phonon dispersion of graphene is known to display two strong Kohn Anomalies (kinks) in the highest optical branch (HOB) at the high-symmetry points Γ and K [Piscanec, S.; et al. Phys. Rev. Lett. 2004, 93, 185503]. The phonon slope around the Kohn anomalies is related to the electron−phonon−coupling (EPC) with the graphene π bands. We show that this EPC, which has

Ultrafast nonequilibrium carrier dynamics in a single

Nonequilibrium carrier dynamics in single exfoliated graphene layers on muscovite substrates are studied by ultrafast optical pump-probe spectroscopy and compared with microscopic theory. The very high 10-fs-time resolution allows for mapping the ultrafast carrier equilibration into a quasi-Fermi distribution and the subsequent slower relaxation stages. Coulomb-mediated carrier-carrier and

Dynamics of Hydrogen Atoms Scattering from Surfaces

ii by a cancellation effect, where the phonon excitation is enhanced for D but the electron-hole pair excitation is reduced. To study the dynamics of chemically activated adsorption of hydrogen atoms, I did a series of experiments on hydrogen atoms scattering from

Molecular Dynamics Investigation on Thermal Conductivity

2020/7/28In the folded graphene, the total scattering event includes intrinsic an-harmonic phonon-phonon scattering, boundary scattering, and phonon-folding scattering. It is reasonable to assume that these scatterings are independent of each other for nano-scale graphene. 38 In Fig. 8 a, it can be found that the TA branch lifetime of AAFG is generally lower than that of the Unfold-AAFG.

Geometry and temperature effects of the interfacial thermal conductance in copper

Geometry and temperature effects of the interfacial thermal conductance in copper– and nickel–graphene nanocomposites This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2012 J. Phys.: Condens. Matter 24 245301

Effects of substrate roughness and electron–phonon

2014/1/3Molecular dynamics simulation and the two-temperature method are carried out to model the effects of substrate roughness as well as electron–phonon coupling on thickness-dependent friction on graphene. It is found that substrate roughness can significantly

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