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

Kihong Kim·Ross H. McKenzie·John W. Wilkins
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Abstract

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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Kihong Kim, Ross H. McKenzie, John W. Wilkins. 1993-11-11. Universal subgap optical conductivity in quasi-one-dimensional Peierls systems. https://doi.org/10.1103/physrevlett.71.4015

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