Elementary Excitations of a Linearly Conjugated Diatomic Polymer

Abstract

The low-lying particlelike excitations of a model linearly conjugated diatomic polymer, ${(A=B)}_x$, are found to be pairs of either spin-0 or spin-½ solitons with irrational charge values. The charge values and excitation energies are calculated as functions of the difference of the energy levels of the atomic $p$ orbitals of the two atomic constitutents of the unit cell. The phonon spectrum of the uniform polymer is also calculated.