TY - JOUR AU - Baran, O.R. PY - 2021/11/01 Y2 - 2024/03/29 TI - Energy Flux Effect in the One-Dimensional Spin-1/2 XX Model of Magnetoelectric. Lagrange Multiplier Method JF - Ukrainian Journal of Physics JA - Ukr. J. Phys. VL - 66 IS - 10 SE - Physics of magnetic phenomena and physics of ferroics DO - 10.15407/ujpe66.10.890 UR - https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2021032 SP - 890 AB - <p>The Lagrange multiplier method is applied to study a nonequilibrium steady state with energy flux in the one-dimensional spin-1/2 XX model of a magnetoelectric with the Katsura–Nagaosa–Balatsky mechanism at sufficiently low temperatures. With the help of the Jordan–Wigner transformation, the problem is reduced to that with the Hamiltonian for spinless noninteracting fermions and can be solved exactly. A number of phase diagrams are plotted, and the dependences of the magnetization, electric polarization, and various susceptibilities on the magnetic and electric fields, as well as on the energy flux, are calculated.</p> ER -