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Charge-density waves arising from two electron bands

Donald W. Buker
Proceedings: Mathematical, Physical and Engineering Sciences
Vol. 467, No. 2125 (8 January 2011), pp. 166-173
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/40998083
Page Count: 8
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Charge-density waves arising from two electron bands
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Abstract

A theory for a quasi-one-dimensional incommensurate charge-density wave state arising from electron-phonon (el-phon) interaction connecting electron states in two different bands is presented. An expression for the fundamental component of the energy gap as a function of the effective el-phon coupling, valid for all coupling strengths, has been found. For a single band, the expression simplifies to a reciprocal hyperbolicsine dependence on the reciprocal effective coupling. The effective coupling, although simply related to the n assumed phonon-band frequencies, is not generally expressible as a sum of independent functions of these frequencies. The theory is applied to tetrathiofulvalinium-tetracyanoquinodimethane and to potassium blue bronze.

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