Bi-Polaron and N-Polaron Binding Energies

Details Bi-Polaron and N-Polaron Binding Energies Bi-Polaron and N-Polaron Binding Energies

2010-04-07

arxiv.org/abs/1004.1196v1

Phys. Rev. Lett. 104, 210402 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

The binding of polarons, or its absence, is an old and subtle topic. Here we prove two things rigorously. First, the transition from many-body collapse to the existence of a thermodynamic limit for N polarons occurs precisely at U=2\alpha, where U is the electronic Coulomb repulsion and \alpha is the polaron coupling constant. Second, if U is large enough, there is no multi-polaron binding of any kind. Considering the known fact that there is binding for some U>2\alpha, these conclusions are not obvious and their proof has been an open problem for some time.

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