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Phase diagram of the Holstein-Hubbard two-leg ladder using a functional renormalization-group method

  • Author(s): Tam, Ka-Ming;
  • Tsai, Shan-Wen;
  • Castro Neto, Antonio H.;
  • Campbell, David K.
  • et al.

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.

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