Wentzel-Bardeen singularity and phase diagram for interacting electrons coupled to acoustic phonons in one dimension

Details Wentzel-Bardeen singularity and phase diagram for interacting electrons coupled to acoustic phonons in one dimension Wentzel-Bardeen singularity and phase diagram for interacting electrons coupled to acoustic phonons in one dimension

1994-08-26

arxiv.org/abs/cond-mat/9408086v1

Physics

Condensed Matter

4 pages, REVTex, 2 figures on request from thierry@goshawk.lanl.gov, to appear in Phys Rev. B

Scientific paper

10.1103/PhysRevB.50.12160

Using a Luttinger liquid description, the correlation function exponents of various response functions are calculated. Their striking sensitivity to the non perturbative Wentzel-Bardeen singularity is discussed. For the Hubbard model coupled to phonons, the equivalent of a phase diagram is established. By increasing the filling factor towards half filling, the Wentzel-Bardeen singularity is rapidly approached. This suppresses antiferromagnetic fluctuations and drives the system in a metallic phase, and ultimately in the triplet superconducting regime.

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