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Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr2IrO4

Dean, MPM; Cao, Y; Liu, X; Wall, S; Zhu, D; Mankowsky, R; Thampy, V; ... Hill, JP; + view all (2016) Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr2IrO4. Nature Materials , 15 (6) pp. 601-605. 10.1038/nmat4641. Green open access

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Abstract

Measuring how the magnetic correlations throughout the Brillouin zone evolve in a Mott insulator as charges are introduced dramatically improved our understanding of the pseudogap, non-Fermi liquids and high TC superconductivity [1–4]. Recently, photoexcitation has been used to induce similarly exotic states transiently [5–7]. However, understanding how these states emerge has been limited because of a lack of available probes of magnetic correlations in the time domain, which hinders further investigation of how light can be used to control the properties of solids. Here we implement magnetic resonant inelastic X-ray scattering at a free electron laser, and directly determine the magnetization dynamics after photo-doping the Mott insulator Sr2IrO4. We find that the non-equilibrium state 2 ps after the excitation has strongly suppressed long-range magnetic order, but hosts photo-carriers that induce strong, non-thermal magnetic correlations. The magnetism recovers its two-dimensional (2D) in-plane N´eel correlations on a timescale of a few ps, while the three-dimensional (3D) longrange magnetic order restores over a far longer, fluence-dependent timescale of a few hundred ps. The dramatic difference in these two timescales, implies that characterizing the dimensionality of magnetic correlations will be vital in our efforts to understand ultrafast magnetic dynamics.

Type: Article
Title: Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr2IrO4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/nmat4641
Publisher version: http://dx.doi.org/10.1038/nmat4641
Language: English
Additional information: Copyright © 2016 Macmillan Publishers Limited. All rights reserved.
Keywords: Magnetic properties and materials, Raman spectroscopy, Ultrafast photonics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1478303
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