Phase Diagram of the Holstein-Hubbard Two-Leg Ladder

Details Phase Diagram of the Holstein-Hubbard Two-Leg Ladder Phase Diagram of the Holstein-Hubbard Two-Leg Ladder

2006-03-02

arxiv.org/abs/cond-mat/0603055v1

Phys. Rev. B 75, 195119 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevB.75.195119

Using a functional renormalization group method, we obtain the phase diagram of the two-leg ladder system within the Holstein-Hubbard model, which includes both electron-electron and electron-phonon interactions. Our renormalization group technique allows us to analyze the problem for both weak and strong electron-phonon coupling. We show that, in contrast results from conventional weak coupling studies, electron-phonon interactions can dominate electron-electron interactions because of retardation effects.

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