PERSISTENT CURRENT-INDUCED BY MAGNETIC-FLUX IN A POLYACETYLENE RING AND FROHLICH SUPERCONDUCTIVITY

We report the study of an electron-phonon model of a Peierls-dimerized chain, namely a polyacetylene ring in the gauge potential of a magnet ic flux. In the presence of the gauge potential the SSH Hamiltonian of a polyacetylene chain is modified. The total energy as well as the pe rsistent current are periodic functions of the magnetic flux. The effe ct of the gauge potential is equivalent to that of a travelling lattic e wave and leads to Frohlich's type of superconductivity from a theore tical viewpoint.