Electron-phonon interaction for adiabatic anharmonic phonons

Details Electron-phonon interaction for adiabatic anharmonic phonons Electron-phonon interaction for adiabatic anharmonic phonons

2005-04-26

arxiv.org/abs/cond-mat/0504688v2

J. Phys.: Condens. Matter 17, 5489-5497 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 3 figures, revised and published version

Scientific paper

10.1088/0953-8984/17/36/005

A model with Holstein-like electron-phonon coupling is studied in the limit of adiabatic phonons. The phonon distribution is anharmonic with two degenerate maxima. This model can be related to fermions in a correlated binary alloy and describes microscopic phase separation. We discuss the weak and strong electron-phonon coupling limit and present a qualitative phase diagram. In terms of the phononic displacements it consists of a homogeneous, an alternating, and a disordered phase. There is a first order phase transition between the homogeneous and the alternating phase, and second order phase transition between the alternating and the disordered phase. The opening of a gap inside the disordered phase is treated by a dynamical mean-field theory.

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