Observation of phonon structure in electron density of states of normal metal

Abstract

Within standard treatments of the interacting electron--phonon system the electron density of states (EDOS) shows no sign of the phonons when the system is in the normal state. On the other hand, emergence of a fine energy scale in the superconducting state makes the phonons readily observable in the EDOS and other spectroscopic quantities. Here we wish to re-examine the conditions under which phonon structure might be present in the normal state. Accounting for a finite, i.e. non-infinite, electronic bandwidth results in easily distinguishable phonon structure in the EDOS. We argue that for narrow band metals, the resolution of photoemission spectroscopy is sufficient for resolving these structures. Manifestations of finite band effects in $K_3{C}_{60}$ are discussed.

References in corpus (12)

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• Superconductivity in Fullerides
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Cited by in corpus (10)

• Effect of electron-phonon interaction on spectroscopies in graphene
• Phonon spectroscopy through the electronic density of states in graphene
• Impurity effects on optical response in a finite band electronic system coupled to phonons
• Optical Sum Rule in Finite Bands
• Intraband Optical Spectral Weight in the presence of a van Hove singularity: application to Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Temperature Dependence of the Conductivity Sum Rule in the Normal State due to Inelastic Scattering
• Impact of a finite cut-off for the optical sum rule in the superconducting state
• Spin-dependent $\pi$${\pi }^{\ast }$ gap in graphene on a magnetic substrate
• Optical Sum Rule anomalies in the High-Tc Cuprates
• Electron-mediated anharmonicity and its role in the Raman spectrum of graphene