First excited state calculation using different phonon bases for the two-site Holstein model

Details First excited state calculation using different phonon bases for the two-site Holstein model First excited state calculation using different phonon bases for the two-site Holstein model

2000-03-15

arxiv.org/abs/cond-mat/0003256v1

Physics

Condensed Matter

11 pages (REVTEX), 4 postscript figures

Scientific paper

10.1142/S0217979200002247

The single-electron energy and static charge-lattice deformation correlations have been calculated for the first excited state of a two-site Holstein model within perturbative expansions using different standard phonon bases obtained through Lang-Firsov (LF) transformation, LF with squeezed phonon states, modified LF, modified LF transformation with squeezed phonon states, and also within weak-coupling perturbation approach. Comparisons of the convergence of the perturbative expansions for different phonon bases reveal that modified LF approach works much better than other approaches for major range of the coupling strength.

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