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

Daniel Loss and Thierry Martin
Phys. Rev. B 50, 12160 – Published 15 October 1994
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Abstract

We consider strongly correlated electrons coupled to low-energy acoustic phonons in one dimension. Using a Luttinger liquid description we calculate the exponents of various response functions and discuss their remarkable sensitivity to the Wentzel-Bardeen singularity induced by the presence of phonons. For the Hubbard model plus phonons the equivalent of a phase diagram is established. By increasing the filling factor towards half filling the Wentzel-Bardeen singularity is approached. This in turn triggers a simple and efficient mechanism to suppress antiferromagnetic fluctuations and to drive the system via a normal metallic state towards a superconducting phase.

  • Received 19 July 1994

DOI:https://doi.org/10.1103/PhysRevB.50.12160

©1994 American Physical Society

Authors & Affiliations

Daniel Loss

  • Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

Thierry Martin

  • Theoretical Division, Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

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Vol. 50, Iss. 16 — 15 October 1994

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