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

Journal article


Publication Details

Author(s): Hong T, Qiu Y, Matsumoto M, Tennant DA, Coester K, Schmidt KP, Awwadi FF, Turnbull MM, Agrawal H, Chernyshev AL
Journal: Nature Communications
Publisher: NATURE PUBLISHING GROUP
Publication year: 2017
Volume: 8
ISSN: 2041-1723
Language: English


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.



FAU Authors / FAU Editors

Schmidt, Kai Phillip Prof. Dr.
Professur für Theoretische Physik


External institutions with authors

Clark University
National Institute of Standards and Technology (NIST)
Oak Ridge National Laboratory
Shizuoka University / 静岡大学
Technische Universität Dortmund
University of California Irvine
University of Jordan


How to cite

APA:
Hong, T., Qiu, Y., Matsumoto, M., Tennant, D.A., Coester, K., Schmidt, K.P.,... Chernyshev, A.L. (2017). Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet. Nature Communications, 8. https://dx.doi.org/10.1038/ncomms15148

MLA:
Hong, Tao, et al. "Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet." Nature Communications 8 (2017).

BibTeX: 

Last updated on 2018-10-08 at 17:39

Share link