Geodesic
Effects of optical intra-gap transitions on superexchange interaction in La$ _2$CuO$ _4$ with nonequilibrium photoexcited centers
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 11 (2018) no. 2, pp. 159-170

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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 operators 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 La$_2$CuO$_4$(further La214).
Keywords: superexchange, optically excited states, Mott-Hubbard insulator. 
@article{JSFU_2018_11_2_a3,
     author = {Semen I. Polukeev and Vladimir A. Gavrichkov and Sergey G. Ovchinnikov},
     title = {Effects of optical intra-gap transitions on superexchange interaction in {La}$ _2${CuO}$ _4$ with nonequilibrium photoexcited centers},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
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     publisher = {mathdoc},
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     number = {2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2018_11_2_a3/}
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Semen I. Polukeev; Vladimir A. Gavrichkov; Sergey G. Ovchinnikov. Effects of optical intra-gap transitions on superexchange interaction in La$ _2$CuO$ _4$ with nonequilibrium photoexcited centers. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 11 (2018) no. 2, pp. 159-170. http://geodesic.mathdoc.fr/item/JSFU_2018_11_2_a3/