Gain of the kinetic energy of bipolarons in the t-J-Holstein model based on electron-phonon coupling

Details Gain of the kinetic energy of bipolarons in the t-J-Holstein model based on electron-phonon coupling Gain of the kinetic energy of bipolarons in the t-J-Holstein model based on electron-phonon coupling

2010-08-19

arxiv.org/abs/1008.3254v1

Phys. Rev. B 82, 125121 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.125121

With increasing electron-phonon coupling as described within the t-J-Holstein model, bipolaron kinetic energy is lowered in comparison with that of the polaron. This effect is accompanied with "undressing" of bipolaron from lattice degrees of freedom. Consequently, the effective bipolaron mass becomes smaller than the polaron mass. Magnetic as well as lattice degrees of freedom cooperatively contribute to formation of spin-lattice bipolarons.

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