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Low-energy electrodynamics of novel spin excitations in the quantum spin ice Yb2Ti2O7

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Listed:
  • LiDong Pan

    (Institute for Quantum Matter, Johns Hopkins University)

  • Se Kwon Kim

    (Institute for Quantum Matter, Johns Hopkins University)

  • A. Ghosh

    (Institute for Quantum Matter, Johns Hopkins University)

  • Christopher M. Morris

    (Institute for Quantum Matter, Johns Hopkins University)

  • Kate A. Ross

    (Institute for Quantum Matter, Johns Hopkins University
    NIST Center for Neutron Research, NIST)

  • Edwin Kermarrec

    (McMaster University)

  • Bruce D. Gaulin

    (McMaster University
    Brockhouse Institute for Materials Research, McMaster University
    Canadian Institute for Advanced Research)

  • S. M. Koohpayeh

    (Institute for Quantum Matter, Johns Hopkins University)

  • Oleg Tchernyshyov

    (Institute for Quantum Matter, Johns Hopkins University)

  • N. P. Armitage

    (Institute for Quantum Matter, Johns Hopkins University)

Abstract

In condensed matter systems, formation of long-range order (LRO) is often accompanied by new excitations. However, in many geometrically frustrated magnetic systems, conventional LRO is suppressed, while non-trivial spin correlations are still observed. A natural question to ask is then what is the nature of the excitations in this highly correlated state without broken symmetry? Frequently, applying a symmetry breaking field stabilizes excitations whose properties reflect certain aspects of the anomalous state without LRO. Here we report a THz spectroscopy study of novel excitations in quantum spin ice Yb2Ti2O7 under a directed magnetic field. At large positive fields, both right- and left-handed magnon and two-magnon-like excitations are observed. The g-factors of these excitations are dramatically enhanced in the low-field limit, showing a crossover of these states into features consistent with the quantum string-like excitations proposed to exist in quantum spin ice in small fields.

Suggested Citation

  • LiDong Pan & Se Kwon Kim & A. Ghosh & Christopher M. Morris & Kate A. Ross & Edwin Kermarrec & Bruce D. Gaulin & S. M. Koohpayeh & Oleg Tchernyshyov & N. P. Armitage, 2014. "Low-energy electrodynamics of novel spin excitations in the quantum spin ice Yb2Ti2O7," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5970
    DOI: 10.1038/ncomms5970
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