Excitonic quasiparticles in a spin–orbit Mott insulator

Jungho Kim, M. Daghofer, A. H. Said, T. Gog, J. van den Brink, G. Khaliullin and B. J. Kim ()
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Jungho Kim: Advanced Photon Source, Argonne National Laboratory
M. Daghofer: Institute for Theoretical Solid State Physics, IFW Dresden
A. H. Said: Advanced Photon Source, Argonne National Laboratory
T. Gog: Advanced Photon Source, Argonne National Laboratory
J. van den Brink: Institute for Theoretical Solid State Physics, IFW Dresden
G. Khaliullin: Max Planck Institute for Solid State Research, Heisenbergstraße 1
B. J. Kim: Max Planck Institute for Solid State Research, Heisenbergstraße 1

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract In condensed matter systems, out of a large number of interacting degrees of freedom emerge weakly coupled quasiparticles (QPs), in terms of which most physical properties are described. The lack of identification of such QPs is a major barrier for understanding myriad exotic properties of correlated electrons, such as unconventional superconductivity and non-Fermi liquid behaviours. Here we report the observation of a composite particle in a quasi-two-dimensional spin–1/2 antiferromagnet Sr2IrO4—an exciton dressed with magnons—that propagates with the canonical characteristics of a QP: a finite QP residue and a lifetime longer than the hopping time scale. The dynamics of this charge-neutral excitation mirrors the fundamental process of the analogous one-hole propagation in the background of spins–1/2, and reveals the same intrinsic dynamics that is obscured for a single, charged-hole doped into two-dimensional cuprates.

Date: 2014
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DOI: 10.1038/ncomms5453

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