Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations

Details Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations

2009-08-21

arxiv.org/abs/0908.3119v2

Phys. Rev. Lett. 103, 186401 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.186401

We explore the influence of two different polarizations of quantum oxygen vibrations on the spacial symmetry of the bound magnetic bipolaron in the context of the t-J model by using exact diagonalization within a limited functional space. Quadratic electron phonon coupling to transverse polarization stabilizes d-wave symmetry. The existence of a magnetic background is essential for the formation of a d-wave bipolaron state. With increasing linear electron phonon coupling to longitudinal polarization the symmetry of a d-wave bipolaron state changes to a p-wave. Bipolaron develops a large anisotropic effective mass.

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