Raman evidence for nonadiabatic effects in optical phonon self-energies of transition metals

Abstract

We report a Raman study of the effect of temperature on the self-energies of optical phonons in a number of transition metals with hexagonal-close-packed structure. Anisotropic softening of phonon energies and narrowing of phonon linewidths with increasing temperature are observed. These effects are reproduced in the calculations of phonon spectral functions based on \textit{ab initio} electronic structures and with carrier scattering by phonons taken into account. The combined observations and results of simulations indicate a relation between observed anomalies and the renormalization of the electron spectrum due to electron-phonon interaction. It is emphasized that the temperature dependence of the phonon energies resembles anharmonic behavior but is actually an electron-induced effect.

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Cited by in corpus (5)

• Nonadiabatic coupling effects in MgB${}_2$ reexamined
• Exact factorization-based density functional theory of electron-phonon systems
• Dynamical renormalization of electron-phonon coupling in conventional superconductors
• Emergence of large non-adiabatic effects induced by the electron-phonon interaction on the complex vibrational quasi-particle spectrum of the doped monolayer MoS${}_2$
• Electron-mediated anharmonicity and its role in the Raman spectrum of graphene