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Title: Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet

The notion of a quasiparticle, such as a phonon, a roton or a magnon, is used in modern condensed matter physics to describe an elementary collective excitation. The intrinsic zero-temperature magnon damping in quantum spin systems can be driven by the interaction of the one-magnon states and multi-magnon continuum. However, detailed experimental studies on this quantum many-body effect induced by an applied magnetic field are rare. Here we present a high-resolution neutron scattering study in high fields on an S=1/2 antiferromagnet C 9H 18N 2CuBr 4. Finally, compared with the non-interacting linear spin–wave theory, our results demonstrate a variety of phenomena including field-induced renormalization of one-magnon dispersion, spontaneous magnon decay observed via intrinsic linewidth broadening, unusual non-Lorentzian two-peak structure in the excitation spectra and a dramatic shift of spectral weight from one-magnon state to the two-magnon continuum.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Shizuoka Univ. (Japan). Dept. of Physics
  4. Technische Univ. of Dortmund (Germany)
  5. Univ. of Erlangen-Nuremberg, Erlangen (Germany)
  6. Univ. of Jordan, Amman (Jordan). Dept. of Chemistry
  7. Clark Univ., Worcester, MA (United States). Carlson School of Chemistry and Biochemistry
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
  9. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-04ER46174; DMR-1508249
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1355873

Hong, Tao, Qiu, Y., Matsumoto, M., Tennant, D. A., Coester, K., Schmidt, K. P., Awwadi, F. F., Turnbull, M. M., Agrawal, H., and Chernyshev, A. L.. Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet. United States: N. p., Web. doi:10.1038/ncomms15148.
Hong, Tao, Qiu, Y., Matsumoto, M., Tennant, D. A., Coester, K., Schmidt, K. P., Awwadi, F. F., Turnbull, M. M., Agrawal, H., & Chernyshev, A. L.. Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet. United States. doi:10.1038/ncomms15148.
Hong, Tao, Qiu, Y., Matsumoto, M., Tennant, D. A., Coester, K., Schmidt, K. P., Awwadi, F. F., Turnbull, M. M., Agrawal, H., and Chernyshev, A. L.. 2017. "Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet". United States. doi:10.1038/ncomms15148. https://www.osti.gov/servlets/purl/1355873.
@article{osti_1355873,
title = {Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet},
author = {Hong, Tao and Qiu, Y. and Matsumoto, M. and Tennant, D. A. and Coester, K. and Schmidt, K. P. and Awwadi, F. F. and Turnbull, M. M. and Agrawal, H. and Chernyshev, A. L.},
abstractNote = {The notion of a quasiparticle, such as a phonon, a roton or a magnon, is used in modern condensed matter physics to describe an elementary collective excitation. The intrinsic zero-temperature magnon damping in quantum spin systems can be driven by the interaction of the one-magnon states and multi-magnon continuum. However, detailed experimental studies on this quantum many-body effect induced by an applied magnetic field are rare. Here we present a high-resolution neutron scattering study in high fields on an S=1/2 antiferromagnet C9H18N2CuBr4. Finally, compared with the non-interacting linear spin–wave theory, our results demonstrate a variety of phenomena including field-induced renormalization of one-magnon dispersion, spontaneous magnon decay observed via intrinsic linewidth broadening, unusual non-Lorentzian two-peak structure in the excitation spectra and a dramatic shift of spectral weight from one-magnon state to the two-magnon continuum.},
doi = {10.1038/ncomms15148},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {5}
}