title: Ultrafast energy- and momentum-resolved dynamics of magnetic correlations in the photo-doped Mott insulator Sr2IrO4.
abstract: Measuring how the magnetic correlations evolve in doped Mott insulators has greatly improved our understanding of the pseudogap, non-Fermi liquids and high-temperature superconductivity. Recently, photo-excitation has been used to induce similarly exotic states transiently. However, the lack of available probes of magnetic correlations in the time domain hinders our understanding of these photo-induced states and how they could be controlled. Here, we implement magnetic resonant inelastic X-ray scattering at a free-electron laser to directly determine the magnetic dynamics after photo-doping the Mott insulator Sr2IrO4. We find that the non-equilibrium state, 2 ps after the excitation, exhibits strongly suppressed long-range magnetic order, but hosts photo-carriers that induce strong, non-thermal magnetic correlations. These two-dimensional (2D) in-plane Néel correlations recover within a few picoseconds, whereas the three-dimensional (3D) long-range magnetic order restores on a fluence-dependent timescale of a few hundred picoseconds. The marked difference in these two timescales implies that the dimensionality of magnetic correlations is vital for our understanding of ultrafast magnetic dynamics.
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: M P M
authors.identifier: 0000-0001-5139-3543
authors.initials: MP
authors.lastname: Dean
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Y
authors.identifier: 0000-0002-3989-158X
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing, China.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.affiliation: ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.
authors.forename: S
authors.identifier: 0000-0002-6136-0224
authors.initials: S
authors.lastname: Wall
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: D
authors.initials: D
authors.lastname: Zhu
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany.|Center for Free Electron Laser Science, D-22761 Hamburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Mankowsky
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: V
authors.initials: V
authors.lastname: Thampy
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: X M
authors.initials: XM
authors.lastname: Chen
authors.affiliation: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK.
authors.forename: J G
authors.initials: JG
authors.lastname: Vale
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: D
authors.initials: D
authors.lastname: Casa
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Jungho
authors.initials: J
authors.lastname: Kim
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Said
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: P
authors.initials: P
authors.lastname: Juhas
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: R
authors.initials: R
authors.lastname: Alonso-Mori
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Glownia
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: A
authors.initials: A
authors.lastname: Robert
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: J
authors.initials: J
authors.lastname: Robinson
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: M
authors.initials: M
authors.lastname: Sikorski
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: S
authors.identifier: 0000-0003-3493-1850
authors.initials: S
authors.lastname: Song
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: M
authors.initials: M
authors.lastname: Kozina
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: H
authors.initials: H
authors.lastname: Lemke
authors.affiliation: SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Patthey
authors.affiliation: RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Owada
authors.affiliation: Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Katayama
authors.affiliation: RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
authors.forename: M
authors.identifier: 0000-0002-2472-1684
authors.initials: M
authors.lastname: Yabashi
authors.affiliation: RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tanaka
authors.affiliation: Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Togashi
authors.affiliation: Department of Physics &Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors.forename: C
authors.identifier: 0000-0003-4737-0693
authors.initials: C
authors.lastname: Rayan Serrao
authors.affiliation: Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany.
authors.forename: B J
authors.initials: BJ
authors.lastname: Kim
authors.affiliation: Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Huber
authors.affiliation: Zernike Institute for Advanced Materials, University of Groningen, Groningen, NL 9747AG, The Netherlands.
authors.forename: C-L
authors.initials: CL
authors.lastname: Chang
authors.affiliation: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK.
authors.forename: D F
authors.initials: DF
authors.lastname: McMorrow
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany.|Center for Free Electron Laser Science, D-22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Först
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Hill
mesh_terms: D007495:Iridium / Q000737:chemistry*; D060526:Magnetic Fields; D056004:Molecular Dynamics Simulation; D013324:Strontium / Q000737:chemistry*; D000072176:Superconductivity
chemical_list: D007495:Iridium; D013324:Strontium