Universal subgap optical conductivity in quasi-one-dimensional Peierls systems

Details Universal subgap optical conductivity in quasi-one-dimensional Peierls systems Universal subgap optical conductivity in quasi-one-dimensional Peierls systems

1993-11-11

arxiv.org/abs/cond-mat/9311029v1

Physics

Condensed Matter

11 pages (+ 3 figures), LATEX (REVTEX 3.0)

Scientific paper

10.1103/PhysRevLett.71.4015

Quasi-one-dimensional Peierls systems with quantum and thermal lattice fluctuations can be modeled by a Dirac-type equation with a Gaussian-correlated off-diagonal disorder. A powerful new method gives the exact disorder-averaged Green function used to compute the optical conductivity. The strong subgap tail of the conductivity has a universal scaling form. The frequency and temperature dependence of the calculated spectrum agrees with experiments on KCP(Br) and trans-polyacetylene.

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