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Title: Excitonic quasiparticles in a spin–orbit Mott insulator

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 Sr 2IrO 4—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.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  2. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany). Inst. for Theoretical Solid State Physics
  3. Max Planck Inst. for Solid State Research, Stuttgart (Germany)
  4. Max Planck Inst. for Solid State Research, Stuttgart (Germany); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Max Planck Inst. for Solid State Research, Stuttgart (Germany)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed-matter physics
OSTI Identifier:
1357466

Kim, Jungho, Daghofer, M., Said, A. H., Gog, T., van den Brink, J., Khaliullin, G., and Kim, B. J.. Excitonic quasiparticles in a spin–orbit Mott insulator. United States: N. p., Web. doi:10.1038/ncomms5453.
Kim, Jungho, Daghofer, M., Said, A. H., Gog, T., van den Brink, J., Khaliullin, G., & Kim, B. J.. Excitonic quasiparticles in a spin–orbit Mott insulator. United States. doi:10.1038/ncomms5453.
Kim, Jungho, Daghofer, M., Said, A. H., Gog, T., van den Brink, J., Khaliullin, G., and Kim, B. J.. 2014. "Excitonic quasiparticles in a spin–orbit Mott insulator". United States. doi:10.1038/ncomms5453. https://www.osti.gov/servlets/purl/1357466.
@article{osti_1357466,
title = {Excitonic quasiparticles in a spin–orbit Mott insulator},
author = {Kim, Jungho and Daghofer, M. and Said, A. H. and Gog, T. and van den Brink, J. and Khaliullin, G. and Kim, B. J.},
abstractNote = {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.},
doi = {10.1038/ncomms5453},
journal = {Nature Communications},
number = ,
volume = 5,
place = {United States},
year = {2014},
month = {7}
}