Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)

TT 61.1: Vortrag

Donnerstag, 19. März 2020, 15:00–15:15, HSZ 201

Out-of-equilibrium magnetism of Sr2IrO4 and La2CuO4 — •Ekaterina Paerschke1, Yao Wang2, and Cheng-Chien Chen31Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria — 2Department of Physics, Harvard University, Cambridge 02138, USA — 3Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA

Ultrafast pump-probe spectroscopy is an efficient tool to characterize and control strongly correlated materials due to its accessibility to both low-energy physics of the equilibrium phase and the novel excited states induced by the pump. Here, we investigate the ultrafast control of quantum magnetism in a half-filled Mott insulator, described by an extended Heisenberg model. This study reveals photo-manipulated magnetic properties for two archetypal Mott insulators: iridate Sr2IrO4 and cuprate La2CuO4. Understanding photo-manipulated spin fluctuations in cuprates and iridates can help to solve the long-standing question of superconductivity absence in the iridates, as spin fluctuations are believed to mediate superconductivity in transitional metal oxides. Starting from a broken-symmetry phase with a (π,π) ordering vector, we find that the various pump conditions can manipulate the competition with the subleading colinear AFM phase. Through the comparison of quantum quench simulations and Floquet analytical theory, we conclude that these manipulations are achieved through transient engineering of effective spin-exchange interactions.

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