Renormalization of triplet populations of a spin dimer in zero magnetic field with quantum transport

Val'kov, V. V.; Aksenov, S. V. Source: LOW TEMPERATURE PHYSICS, 45 (2):165-175; 10.1063/1.5086406 FEB 2019

Based on the nonequilibrium Keldysh technique in the atomic representation, the effect of inducing a varied population of magnetic states of a spin dimer interacting with electrons transported through a system in a zero magnetic field was studied. In order to find the filling numbers of the quantum states of the system under the strong nonequilibrium condition, a system of kinetic equations was derived and solved by the method of nonequilibrium diagram technique for Hubbard operators. Numerical analysis of these equations made it possible to reveal nonequilibrium renormalizations when accounting for strong spin-fermion correlations.