Journal of Siberian Federal University. Mathematics & Physics / Effects of Optical Intra-gap Transitions on Superexchange Interaction in La2CuO4 with Nonequilibrium Photoexcited Centers

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Issue
Journal of Siberian Federal University. Mathematics & Physics: 2018, Vol. 11, Issue 2
Authors
Polukeev, Semen I.; Gavrichkov, Vladimir A.; Ovchinnikov, Sergey G.
Contact information
Polukeev, Semen I.: Kirensky Institute of Physics Federal Research Center KSC SB RAS Akademgorodok, 50/38, Krasnoyarsk, 660036, Russia; ; ; Gavrichkov, Vladimir A.: Kirensky Institute of Physics Federal Research Center KSC SB RAS Akademgorodok, 50/38, Krasnoyarsk, 660036, Russia; Ovchinnikov, Sergey G.: Kirensky Institute of Physics Federal Research Center KSC SB RAS Akademgorodok, 50/38, Krasnoyarsk, 660036 Institute of Engineering Physics and Radio Electronics Siberian Federal University Svobodny, 79, Krasnoyarsk, 660041 Russia
Keywords
superexchange; optically excited states; Mott-Hubbard insulator
Abstract

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)

Pages
159–170
Paper at repository of SibFU
http://elib.sfu-kras.ru/handle/2311/71041