抄録
The ground states of nearly quarter-filled one-dimensional electron-phonon systems are numerically investigated by using Su-Schrieffer-Heeger’s model and a Fröhlich-type model. When the electron filling factor is very near to but different from 1/4, the ground state is the soliton lattice. The structure factors of the CDW’s in the soliton lattice states are calculated and their square moduli are found to have several peaks, the main one corresponding to the 2kF mode and others being explained as its higher harmonics. The behaviour of the higher harmonics as functions of the filling factor and the electron-phonon coupling constant is studied and the model dependence is discussed. The distribution of the field gradient at off-chain sites due to the CDW is considered in connection with the quadrupole shift of the recent NMR measurement in Rb0.3MoO3.
