Universal Subgap Optical Conductivity In Quasi-One-Dimensional Peierls Systems

TitleUniversal Subgap Optical Conductivity In Quasi-One-Dimensional Peierls Systems
Publication TypeJournal Article
Year of Publication1993
AuthorsKim, K., McKenzie Ross H., and Wilkins J. W.
JournalPhysical Review Letters
Volume71
Issue24
Pagination4015–4018
AbstractQuasi-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.