Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Correlated Electrons: Low-Dimensional Systems - Models 3
TT 25.12: Vortrag
Dienstag, 12. März 2013, 12:45–13:00, H9
Exact description of the magnetoelectric effect in the spin-1/2 XXZ-chain with Dzyaloshinskii-Moriya interaction — Vadim Ohanyan1, Andreas Kluemper2, and •Michael Brockmann2,3 — 1Yerevan State University, 1 Alex Manoogian 0025 Yerevan, Armenia — 2Bergische Universitaet Wuppertal, Gauss str.20, D-42119, Wuppertal, Germany — 3University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
We considered the S=1/2 XXZ-chain with DM-term in the context of magnetoelectric effect realized by means of Katsura-Nagaosa-Baladsky(KNB) mechanism, which connects the local polarization with the cross product of two neighboring spin. Considering, thus, the DM-term as an interaction between local polarization and external electric field, we apply the quantum transfer matrix(QTM) and non-linear integral equation(NLIE) technique for exact description of the mutual influence of magnetic and dielectric properties at finite temperatures, known as the magnetoelectric effect. We obtain the exact plots of polarization(magnetization) dependence on magnetic(electric) filed as well as temperature dependence of the magnetoelectric tensor. The results, particularly, show several possible regimes of polarization, linear, square-root, quadratic and some combination of them. The switching between different regimes can be easily performed by adjusting the magnetic field.