| Phase diagram of the Holstein-Hubbard two-leg ladder using a functional renormalization-group method (2007) | |||||||||||
Abstract | |||||||||||
| 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 couplings. We show that, in contrast to results from conventional weak-coupling studies, electron-phonon interactions can dominate electron-electron interactions, and retardation effects play an important role on the phase diagram. | |||||||||||
Details der Publikation | |||||||||||
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