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

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Details zur Publikation

Autorinnen und Autoren: Hong T, Qiu Y, Matsumoto M, Tennant DA, Coester K, Schmidt KP, Awwadi FF, Turnbull MM, Agrawal H, Chernyshev AL
Zeitschrift: Nature Communications
Verlag: NATURE PUBLISHING GROUP
Jahr der Veröffentlichung: 2017
Band: 8
ISSN: 2041-1723
Sprache: Englisch


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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

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


Einrichtungen weiterer Autorinnen und Autoren

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


Zitierweisen

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).

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Zuletzt aktualisiert 2018-10-08 um 17:39

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