Nonlocal Screening, Electron-Phonon Coupling, and Phonon Renormalization in Metals

Peihong Zhang, Steven G. Louie, and Marvin L. Cohen
Phys. Rev. Lett. 94, 225502 – Published 8 June 2005

Abstract

A method for calculating the phonon self-energy in metals arising from the coupling between phonons and electrons near the Fermi surface is developed. The essence of this scheme is the separation of the inter- and intraband parts of the electron polarizability. The intraband contribution provides extra screenings and is closely related to the electron-phonon coupling and phonon softening in metals. Applications of this scheme to phonons in MgB2 give excellent results when compared with experiments and previous theoretical work. In addition, both electron and hole dopings are found to reduce the renormalization effect of the E2g phonon mode, which indicates a weakened electron-phonon coupling in the doped systems.

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  • Received 18 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.225502

©2005 American Physical Society

Authors & Affiliations

Peihong Zhang, Steven G. Louie, and Marvin L. Cohen

  • Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA

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Issue

Vol. 94, Iss. 22 — 10 June 2005

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