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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Tao Hong & Y. Qiu & M. Matsumoto & D. A. Tennant & K. Coester & K. P. Schmidt & F. F. Awwadi & M. M. Turnbull & H. Agrawal & A. L. Chernyshev, 2017. "Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15148
    DOI: 10.1038/ncomms15148
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    Cited by:

    1. Kirill Yu. Povarov & David E. Graf & Andreas Hauspurg & Sergei Zherlitsyn & Joachim Wosnitza & Takahiro Sakurai & Hitoshi Ohta & Shojiro Kimura & Hiroyuki Nojiri & V. Ovidiu Garlea & Andrey Zheludev &, 2024. "Pressure-tuned quantum criticality in the large-D antiferromagnet DTN," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Tao Hong & Tao Ying & Qing Huang & Sachith E. Dissanayake & Yiming Qiu & Mark M. Turnbull & Andrey A. Podlesnyak & Yan Wu & Huibo Cao & Yaohua Liu & Izuru Umehara & Jun Gouchi & Yoshiya Uwatoko & Masa, 2022. "Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Xiaojian Bai & Shang-Shun Zhang & Hao Zhang & Zhiling Dun & W. Adam Phelan & V. Ovidiu Garlea & Martin Mourigal & Cristian D. Batista, 2023. "Instabilities of heavy magnons in an anisotropic magnet," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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