Spin precession of a polaron induced by a gate voltage in one-dimensional organic polymers

We theoretically investigated the spin dynamics of a polaron under a gate voltage in a one-dimensional organic polymer chain. Spin precession is obtained when a polaron transports along the polymer chain. The spin precession has a certain periodic length, which is in inverse proportion to the strength of the spin-orbital interaction. It was found that spin precession takes place only on the polaron level (intralevel spin precession), while in a rigid semiconductor spin precession takes place among all the conduction levels (interlevel spin precession). In addition, the periodic length of polaron spin precession becomes longer for stronger electron-lattice interaction, indicating long spin relaxation in organic polymers.