Excitonic quasiparticles in a spin–orbit Mott insulator

Kim, Jungho; Daghofer, M.; Said, A. H.; Gog, T.; van den Brink, J.; Khaliullin, G.; Kim, B. J.

doi:10.1038/ncomms5453

Excitonic quasiparticles in a spin–orbit Mott insulator

Journal Article · Thu Jul 17 00:00:00 EDT 2014 · Nature Communications

DOI:https://doi.org/10.1038/ncomms5453· OSTI ID:1357466

Kim, Jungho ^[1]; Daghofer, M. ^[2]; Said, A. H. ^[1]; Gog, T. ^[1]; van den Brink, J. ^[2]; Khaliullin, G. ^[3]; Kim, B. J. ^[4]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany). Inst. for Theoretical Solid State Physics
Max Planck Inst. for Solid State Research, Stuttgart (Germany)
Max Planck Inst. for Solid State Research, Stuttgart (Germany); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division

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. In this paper, 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. Finally, 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Max Planck Inst. for Solid State Research, Stuttgart (Germany)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Contributing Organization:: Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1357466

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 5; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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