Hamburg 2001 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Fachsymposium: Eindimensionale Übergangsmetalle

TT 11.13: Hauptvortrag

Dienstag, 27. März 2001, 19:30–20:00, A

Fluctuation effects in disordered Peierls chains — •Peter Kopietz and Lorenz Bartosch — Inst. fuer theor. Physik, Uni Frankfurt, Robert-Mayer-Str. 8-10, 60054 Frankfurt

We review our recent work on fluctuation effects in disordered Peierls chains [1-4], which is based on numerical and exact analytical solutions of the one-dimensional fluctuating gap model with various types of probability distributions for the fluctuating gap. We pay particular attention to the effect of phase and amplitude fluctations on the low-energy behavior of the average density of states, which determines the low-temperature thermodynamics of the model.

[1] L. Bartosch and P. Kopietz, Singularities and Pseudogaps in the density of states of Peierls chains, Phys. Rev. Lett. 82, 988 (1999).
[2] L. Bartosch and P. Kopietz, Exact numerical calculation of the density of states of the fluctuating gap model, Phys. Rev. B. 60, 15488 (1999).
[3] L. Bartosch and P. Kopietz, Exactly solvable toy model for the pseudogap state, Eur. Phys. J. B 17, 555 (2000).
[4] L. Bartosch and P. Kopietz, Classical phase fluctuations in incommensurate Peierls chains, Phys. Rev. B 62, Dec. 2000 (in press).