Gap formation and soft phonon mode in the Holstein model

Details Gap formation and soft phonon mode in the Holstein model Gap formation and soft phonon mode in the Holstein model

2002-06-19

arxiv.org/abs/cond-mat/0206366v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.89.196401

We investigate electron-phonon coupling in many-electron systems using dynamical mean-field theory in combination with the numerical renormalization group. This non-perturbative method reveals significant precursor effects to the gap formation at intermediate coupling strengths. The emergence of a soft phonon mode and very strong lattice fluctuations can be understood in terms of Kondo-like physics due to the development of a double-well structure in the effective potential for the ions.

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