Some effects of phonon dynamics on electron lifetime, mass renormalization, and superconducting transition temperature

Allen, Philip B.; Silberglitt, Richard

doi:10.1103/physrevb.9.4733

Cited by 89 publications

(41 citation statements)

References 21 publications

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“…In order to calculate the electron-phonon coupling ͑EPC͒ component of the phonon frequencies, broadenings, and relative Raman intensities as functions of n and n top , we consider the ⌫ phonon self-energy, 27,28 projected onto the subspace of the two E 2g and the two E u modes…”

Section: Computational Detailsmentioning

confidence: 99%

Probing the electrostatic environment of bilayer graphene using Raman spectra

et al. 2009

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The Raman shift, broadening, and relative Raman intensities of bilayer graphene are computed as functions of the electron concentration. We include dynamic effects for the phonon frequencies and we consider the gap induced in the band structure of bilayer graphene by an external electric field. We show that from the analysis of the Raman spectra of gated bilayer graphene it is possible to quantitatively identify the amount of charges coming from the atmosphere and from the substrate. These findings suggest that Raman spectroscopy of bilayer graphene can be used to characterize the electrostatic environment of few-layers graphene.

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Section: Computational Detailsmentioning

confidence: 99%

Probing the electrostatic environment of bilayer graphene using Raman spectra

et al. 2009

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“…Phonon frequencies were calculated based on the density functional linear-response theory, 28 and a 4 × 4 × 4 q-mesh in the first BZ was used in the interpolation of the force constants for the phonon dispersions. The EPC spectral function α 2 F (ω) can be expressed in terms of the phonon linewidth γ qj , owing to electron-phonon scattering, [29][30][31] …”

Section: Computational Detailsmentioning

confidence: 99%

Metallic and superconducting gallane under high pressure

et al. 2011

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Using our newly developed particle swarm optimization algorithm on crystal structural prediction, we characterized the pressure-induced structural transition sequence of gallane (GaH 3 ). As has been observed in alane (AlH 3 ), enthalpy calculations reveal that the Pm3n structure of GaH 3 becomes stable above 160 GPa, below which it is unstable with respect to elemental decomposition. Interestingly, the Pm3n structure is metallic, and the application of the Allen-Dynes modified McMillan equation reveals a high superconducting transition temperature (T c ), which reaches 86 K at 160 GPa and increases with decreasing pressure (T c = 102 K at 120 GPa). Our band structure calculations demonstrate that GaH 3 within the Pm3n structure is a highly ionic solid, where the ionicity of H atoms plays an important role in the predicted high temperature superconductivity.

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“…For the phonon frequencies calculation, we used a 16 × 16 × 16 Monkhorst-Pack grid for the electronic Brillouin Zone integration and first order Hermite-Gaussian smearing 42 of 0.025 Ry. The electron-phonon coupling contribution to the linewidth (full width half maximum ) at momentum q for the ν phonon mode, with frequency ω qν can be written as 43 :…”

Section: B Calculationsmentioning

confidence: 99%

Weak anharmonic effects inMgB2: A comparative inelastic x-ray scattering and Raman study

et al. 2007

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We study anharmonic effects in MgB2 by comparing Inelastic X-ray and Raman scattering together with ab-initio calculations. Using high statistics and high q resolution measurements we show that the E2g mode linewidth is independent of temperature along ΓA. We show, contrary to previous claims, that the Raman-peak energy decreases as a function of increasing temperature, a behaviour inconsistent with all the anharmonic ab-initio calculations of the E2g mode at Γ available in literature. These findings and the excellent agreement between the X-ray measured and ab initio calculated phonon spectra suggest that anharmonicity is not the main mechanism determining the temperature behaviour of the Raman-peak energy. The Raman E2g peak position and linewidth can be explained by large dynamical effects in the phonon self-energy. In light of the present findings, the commonly accepted explanation of the reduced isotope effect in terms of anharmonic effects needs to be reconsidered.

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Some effects of phonon dynamics on electron lifetime, mass renormalization, and superconducting transition temperature

Cited by 89 publications

References 21 publications

Probing the electrostatic environment of bilayer graphene using Raman spectra

Probing the electrostatic environment of bilayer graphene using Raman spectra

Metallic and superconducting gallane under high pressure

Weak anharmonic effects inMgB2: A comparative inelastic x-ray scattering and Raman study

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