On the stability of polaronic superlattices in strongly coupled electron-phonon systems
G. Wellein, H. Fehske, H. Büttner, A. R. Bishop
Abstract
We investigate the interplay of electron-phonon (EP) coupling and strong electronic correlations in the frame of the two-dimensional (2D) Holstein t-J model (HtJM), focusing on polaronic ordering phenomena for the quarter-filled band case. The use of direct Lanczos diagonalization on finite lattices allows us to include the effects of quantum phonon fluctuations in the calculation of spin/charge structure factors and hole-phonon correlation functions. In the adiabatic strong coupling regime we found evidence for ``self-localization'' of polaronic carriers in a (π,π) charge-modulated structure, a type of superlattice solidification reminiscent of those observed in the nickel perovskites La2-xSrxNiO4+y.
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