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

Tao Hong (), Y. Qiu, M. Matsumoto, D. A. Tennant, K. Coester, K. P. Schmidt, F. F. Awwadi, M. M. Turnbull, H. Agrawal and A. L. Chernyshev
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Tao Hong: Oak Ridge National Laboratory
Y. Qiu: National Institute of Standards and Technology
M. Matsumoto: Shizuoka University
D. A. Tennant: Oak Ridge National Laboratory
K. Coester: Lehrstuhl für Theoretische Physik I, TU Dortmund
K. P. Schmidt: Lehrstuhl für Theoretische Physik I
F. F. Awwadi: The University of Jordan
M. M. Turnbull: Carlson School of Chemistry and Biochemistry, Clark University
H. Agrawal: Oak Ridge National Laboratory
A. L. Chernyshev: University of California

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/ncomms15148

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