An accurate mapping of quantum Heisenberg magnetic models of spin s to strong-coupling magnon systems

摘要: An infinite-U term is introduced into the Holstein - Primakoff-transformed magnon Hamiltonian of quantum Heisenberg magnetic models spin s. This removes unphysical spin-wave states at every site, and automatically truncates expansion in powers occupation operator. The resultant strong-coupling Hamiltonians are accurately equivalent to original Hamiltonians. on-site U-levels their implications studied. Within a simple decoupling approximation for our models, we can easily reproduce results (sublattice) magnetizations obtained previously model. But bosonic without any allow substantially improved values be spectral weight ground state, ground-state energies lower than those within previous approximations.