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

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.

preprint2010arXivOpen access
Lev VidmarJanez Bonca
cond-mat.str-el
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Lev VidmarJanez Bonca

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