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

LiDong Pan, Se Kwon Kim, A. Ghosh, Christopher M. Morris, Kate A. Ross, Edwin Kermarrec, Bruce D. Gaulin, S. M. Koohpayeh, Oleg Tchernyshyov and N. P. Armitage ()
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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
Edwin Kermarrec: McMaster University
Bruce D. Gaulin: McMaster University
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

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5970

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