Coulomb blockade effect in collision of two acoustic polarons

Collision between two acoustic polarons, which are complexes of an electron near the band bottom and lattice distortions around it, is numerically studied by using Su, Schrieffer and Heegerʹs model extended to include short-ranged electronic interactions. When the two polarons have opposite spins, their collision looks quite repulsive in the absence of electronic repulsive interactions. Contrary to intuition, this effective repulsion is reduced by relatively weak electronic interactions. Detailed analyses indicate that a kind of “Coulomb blockade effect” might explain this reduction.