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

Autor: Dean MP; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA., Cao Y; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA., Liu X; 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., Wall S; ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain., Zhu D; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Mankowsky R; Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany.; Center for Free Electron Laser Science, D-22761 Hamburg, Germany., Thampy V; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA., Chen XM; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA., Vale JG; London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK., Casa D; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA., Kim J; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA., Said AH; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA., Juhas P; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA., Alonso-Mori R; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Glownia JM; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Robert A; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Robinson J; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Sikorski M; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Song S; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Kozina M; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Lemke H; Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA., Patthey L; SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland., Owada S; RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan., Katayama T; Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan., Yabashi M; RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan., Tanaka Y; RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan., Togashi T; Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan., Liu J; Department of Physics &Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA., Rayan Serrao C; Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA., Kim BJ; Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany., Huber L; Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland., Chang CL; Zernike Institute for Advanced Materials, University of Groningen, Groningen, NL 9747AG, The Netherlands., McMorrow DF; London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK., Först M; Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany.; Center for Free Electron Laser Science, D-22761 Hamburg, Germany., Hill JP; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA.
Jazyk: angličtina
Zdroj: Nature materials [Nat Mater] 2016 Jun; Vol. 15 (6), pp. 601-5. Date of Electronic Publication: 2016 May 09.
DOI: 10.1038/nmat4641
Abstrakt: 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.
Databáze: MEDLINE
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