Exact numerical diagonalization of one-dimensional interacting electrons nonadiabatically coupled to phonons

Details Exact numerical diagonalization of one-dimensional interacting electrons nonadiabatically coupled to phonons Exact numerical diagonalization of one-dimensional interacting electrons nonadiabatically coupled to phonons

1995-03-29

arxiv.org/abs/cond-mat/9503151v2

Physics

Condensed Matter

latex manuscript (7 pages), 3 eps figures; revised version, better discussion, one figure replaced; to be published in Europhy

Scientific paper

10.1209/epl/i1996-00427-7

We study the role of non-adiabatic Holstein electron-phonon coupling on the neutral-ionic phase transition of charge transfer crystals which can be tuned from continuous to discontinuous, using exact numerical diagonalization. The variation of electronic properties through the transition is smoothed by nonadiabaticity. Lattice properties are strongly affected, and we observe both squeezing and antisqueezing, depending on details of the adiabatic potentials, and identify the quantum uncertainty of the phonons as the most sensitive measure of nonadiabaticity. The adiabatic limit is regular for a continuous transition but turns out completely inadequate near a discontinuous transition. The relevance of coherent state approaches is assessed critically.

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