Low-energy electrodynamics of novel spin excitations in the quantum spin ice Yb2Ti2O7 Academic Article uri icon

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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 <001> 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 <001> fields.

authors

  • Pan, LiDong
  • Kim, Se Kwon
  • Ghosh, A
  • Morris, Christopher M
  • Ross, Kate A
  • Kermarrec, Edwin
  • Gaulin, Bruce D
  • Koohpayeh, SM
  • Tchernyshyov, Oleg
  • Armitage, NP

publication date

  • September 18, 2014