Magnon-mediated binding between holes in an antiferromagnet

摘要

The long-range forces between holes in an antiferromagnet are due to magnon exchange. The one-magnon exchange potential between two holes is proportional to cos(2 phi)/r (2) where r is the distance vector of the holes and phi is the angle between r and an axis of the square crystal lattice. One-magnon exchange leads to bound states of holes with antiparallel spins resembling d-wave symmetry.