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Magnon bound states versus anyonic Majorana excitations in the Kitaev honeycomb magnet α-RuCl3

Author

Listed:
  • Dirk Wulferding

    (TU Braunschweig
    TU Braunschweig
    Institute for Basic Science (IBS))

  • Youngsu Choi

    (Chung-Ang University)

  • Seung-Hwan Do

    (Chung-Ang University)

  • Chan Hyeon Lee

    (Chung-Ang University)

  • Peter Lemmens

    (TU Braunschweig
    TU Braunschweig)

  • Clément Faugeras

    (University of Grenoble Alpes, INSA Toulouse, University of Toulouse Paul Sabatier, EMFL, CNRS, LNCMI)

  • Yann Gallais

    (Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS))

  • Kwang-Yong Choi

    (Chung-Ang University)

Abstract

The pure Kitaev honeycomb model harbors a quantum spin liquid in zero magnetic fields, while applying finite magnetic fields induces a topological spin liquid with non-Abelian anyonic excitations. This latter phase has been much sought after in Kitaev candidate materials, such as α-RuCl3. Currently, two competing scenarios exist for the intermediate field phase of this compound (B = 7 − 10 T), based on experimental as well as theoretical results: (i) conventional multiparticle magnetic excitations of integer quantum number vs. (ii) Majorana fermionic excitations of possibly non-Abelian nature with a fractional quantum number. To discriminate between these scenarios a detailed investigation of excitations over a wide field-temperature phase diagram is essential. Here, we present Raman spectroscopic data revealing low-energy quasiparticles emerging out of a continuum of fractionalized excitations at intermediate fields, which are contrasted by conventional spin-wave excitations. The temperature evolution of these quasiparticles suggests the formation of bound states out of fractionalized excitations.

Suggested Citation

  • Dirk Wulferding & Youngsu Choi & Seung-Hwan Do & Chan Hyeon Lee & Peter Lemmens & Clément Faugeras & Yann Gallais & Kwang-Yong Choi, 2020. "Magnon bound states versus anyonic Majorana excitations in the Kitaev honeycomb magnet α-RuCl3," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15370-1
    DOI: 10.1038/s41467-020-15370-1
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    Cited by:

    1. Youngsu Choi & Suheon Lee & Je-Ho Lee & Seungyeol Lee & Maeng-Je Seong & Kwang-Yong Choi, 2021. "Bosonic spinons in anisotropic triangular antiferromagnets," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    2. Xu-Guang Zhou & Han Li & Yasuhiro H. Matsuda & Akira Matsuo & Wei Li & Nobuyuki Kurita & Gang Su & Koichi Kindo & Hidekazu Tanaka, 2023. "Possible intermediate quantum spin liquid phase in α-RuCl3 under high magnetic fields up to 100 T," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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