Journal
PHYSICAL REVIEW B
Volume 75, Issue 8, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.75.081101
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We derive exactly all Green's functions for the two-site Hubbard-Holstein model. We then study the bipolaron phase diagram, with emphasis on its unbinding into two polarons and on the crossover from a two-site to a one-site bipolaron. The results are relevant for infinite-size systems.
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