Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.101: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Quantum heat engine operating with multiferroic chain working substance — •Maryam Azimi1, Levan Chotorlishvili1, Sunil Kumar Mishra2, Teimuraz Vekua3, Wolfgang Hübner4, and Jamal Berakdar1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — 2Department of Physics, Indian Institute of Technology, Banaras Hindu University, Varanasi - 221005, India — 3Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Germany — 4Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, PO Box 3049, 67653 Kaiserslautern, Germany
In this work we study the quantum Otto engine[1,2] with the working substance of frustrated ferromagnetic spin-1/2 chain[3,4]. The presence of the finite spin chirality in the working substance allows driving a cycle by the external electric field. We observe a direct connection between chirality, entanglement and the efficiency of the engine and find the existence of a threshold temperature above which the pair correlations in the system quantified by thermal entanglement decay to zero. We also find a direct correlation between threshold temperature of pair entanglement, with the spin chirality and the minimum of the fidelities related to the electric and magnetic field. The efficiency of the quantum Otto cycle shows a saturation plateau with the increase of the electric field amplitude. [1]H. T. Quan et al., Phys. Rev.E. 76, 031105 (2007). [2]R. Wang et al., Phys. Rev. E. 86,021133 (2012). [3]M. Mostovoy, Phys. Rev. Lett. 96, 067601 (2006). [4]M. Menzel et al., Phys. Rev. Lett. 108, 197204 (2012).