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

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.

doi:10.1038/ncomms15148

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

Journal Article · Fri May 05 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms15148· OSTI ID:1355873

Hong, Tao ^[1]; Qiu, Y. ^[2]; Matsumoto, M. ^[3]; Tennant, D. A. ^[1]; Coester, K. ^[4]; Schmidt, K. P. ^[5]; Awwadi, F. F. ^[6]; Turnbull, M. M. ^[7]; Agrawal, H. ^[8]; Chernyshev, A. L. ^[9]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Shizuoka Univ. (Japan). Dept. of Physics
Technische Univ. of Dortmund (Germany)
Univ. of Erlangen-Nuremberg, Erlangen (Germany)
Univ. of Jordan, Amman (Jordan). Dept. of Chemistry
Clark Univ., Worcester, MA (United States). Carlson School of Chemistry and Biochemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

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. 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; FG02-04ER46174; DMR-1508249

OSTI ID:: 1355873

Alternate ID(s):: OSTI ID: 1784333

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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