Quantum breathers and modulational instability in quantum zigzag spin chains with alternative combination ferromagnetic and antiferromagnetic interactions in an external magnetic field

摘要: Abstract Quantum breathers properties and modulational instability in quantum zigzag spin chains with alternative combination ferro-antiferromagnetic interactions are carried out. For a few number of bosons, by using the states method numerical diagonalization, energy spectrum, multi-quantum theirs new found. large based on time dependent Hartree approximation semi-discrete multiple-scale method, we provide detailed analytical analysis, discuss conditions to obtain solitons bright localized solutions predict formation regions system. In both configurations, have constructed deduced their energies. Furthermore analysis done appearance instabilities predicted our investigations found full agreement. Convincing quantitative agreement has been between approaches simulations for instability. Experimental data Rb2Cu2Mo3O12 parameters used this work.