Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.16: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Quantum information processing based on multiferroic helical spin chain — •maryam azimi1, levan chotorlishvili1, sunil kumar mishra2, sebastian greshner3, teimuraz vekua3, wolfgang hübner4, and jamal berakdar1 — 1Institute of Physics, Martin-Luther University, 06120 Halle, Germany — 2Department of Physics, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India — 3Institute of Theoretical Physics, Leibniz University, 30167 Hannover, Germany — 4Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, PO Box 3049, D-67653 Kaiserslautern, Germany
We show that quantum information features and quantum phases are extremely sensitive to an external electric field applied to one dimensional frustrated spin 1/2 chains[1]. The electric field leads to the formation of chiral spin structure and simultaneously generates entanglement characterized by many spin correlation[2]. We also use this system as a working substance for a quantum Otto heat engine[3,4]and detect a direct connection between the chirality, the entanglement and the efficiency of the engine. Also a relation between the threshold temperature of pair entanglement with the spin chirality and the minimum of the fidelities related to the electric and the magnetic field is obtained. By increasing the electric field the efficiency of the quantum Otto cycle reaches a saturation status. [1] M. Menzel et al., Phys. Rev. Lett. 108, 197204 (2012). [2] M. Azimi et al., Phys. Rev. B 89, 024424 (2014). [3] H. T. Quan et al., Phys. Rev.E. 76, 031105 (2007). [4] M. Azimi et al., New Journal of Physics 16, 063018 (2014).