Temperature- and quantum phonon effects on Holstein-Hubbard bipolarons

  title={Temperature- and quantum phonon effects on Holstein-Hubbard bipolarons},
  author={Martin Hohenadler and Wolfgang von der Linden},
  journal={Physical Review B},
The one-dimensional Holstein-Hubbard model with two electrons of opposite spin is studied using an extension of a recently developed quantum Monte Carlo method, and a very simple yet rewarding variational approach, both based on a canonically transformed Hamiltonian. The quantum Monte Carlo method yields very accurate results in the regime of small but finite phonon frequencies, characteristic of many strongly correlated materials such as, e.g., the cuprates and the manganites. The influence of… 
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