On Fermion-Magnon Bound States in Strong Magnetic Field: Analysis of the Extended Hubbard Model
Numerical calculations of bound state energies of a delocalized fermion and magnons in strong magnetic field are presented. Ал analysis has been done in the framework of an extended Hubbard model, strictly speaking, a Kondo-like model. One of the characteristic feature of such a model is an 'anti'-Nagaoka behaviour unusual for strongly correlated fermion systems. In the case of a weak doping, when the free fermion interaction can be neglected, the dependence of magnetization on magnetic field should exhibit a step-like behaviorSteps are mostly of the same amplitude, which is proportional to the concentration of electrons (holes). The critical values of the magnetic field are accompaned with giant absorption (irradiation) of magnons. Most likely, the effect discussed below is better to look for in 3ci-compounde with a moderate value of antiferromagnetic exchange constant J.