A Theory of the Onset and the Pinning of Charge Density Wave in a Quasi One-Dimensional Conductor

概要

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Two kinds of functions of the impurity are studied for the charge density wave (CDW) in a quasi one-dimensional conductor, by considering the case of a single impurity. We formulate our problem in the self-consistent field approximation and near the transition point to the CDW state. It is pointed out that the impurity-induced Friedel oscillation of electron density as well as the symmetry-breaking effect of impurity in the usual sense governs the processes of the onset and the pinning of CDW below the transition point. They are described in terms of the effective local Fermi wavenumber and the local amplitude of CDW. Both the functions work cooperatively, so that the effective local Fermi wavenumber remains uniform in a range as wide as possible. Concerning the amplitude they work destructively in an important range of distance from the impurity. The distortion above the transition point is expressed by the effective local Fermi wavenumber and a localized amplitude. It is essentially a long-ranged reproduction of the Friedel oscillation, as the Friedel oscillation is the sole source of distortion.
理論物理学刊行会の論文
1981-01-25