Effects of Optical Intra-gap Transitions on Superexchange Interaction in La2CuO4 with Nonequilibrium Photoexcited Centers

Polukeev, SI; Gavrichkov, VA; Ovchinnikov, SG OURNAL OF SIBERIAN FEDERAL UNIVERSITY-MATHEMATICS & PHYSICS, 11 (2):159-170; 10.17516/1997-1397-2018-11-2-159-170 2018

We investigated the effects of excited many-electron states in the optical control of the magnetic state in undoped Mott-Hubbard insulator. To derive the spin Hamiltonian in material under optical pumping we have used many-electron approach based on the X-operator representation. Extending the projection op erators approach on arbitrary energy spectra of the Mott-Hubbard insulator, we obtained the Hamiltonian of superexchange interaction in analytical form. The Hamiltonian includes the spin-exciton variables which are usually missing in discussion on the magnetic response to optical pumping, and is not additive over contributions from the ground and optically excited states. As a test, a microscopic background for the optical induced superexchange was analyzed in La2CuO4(further La214)