Fractionalized excitations in the partially magnetized spin liquid candidate YbMgGaO4

Yao Shen, Yao-Dong Li, H. C. Walker, P. Steffens, M. Boehm, Xiaowen Zhang, Shoudong Shen, Hongliang Wo, Gang Chen () and Jun Zhao ()
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Yao Shen: Fudan University
Yao-Dong Li: Fudan University
H. C. Walker: Chilton
P. Steffens: Institut Laue-Langevin
M. Boehm: Institut Laue-Langevin
Xiaowen Zhang: Fudan University
Shoudong Shen: Fudan University
Hongliang Wo: Fudan University
Gang Chen: Fudan University
Jun Zhao: Fudan University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Quantum spin liquids (QSLs) are exotic states of matter characterized by emergent gauge structures and fractionalized elementary excitations. The recently discovered triangular lattice antiferromagnet YbMgGaO4 is a promising QSL candidate, and the nature of its ground state is still under debate. Here we use neutron scattering to study the spin excitations in YbMgGaO4 under various magnetic fields. Our data reveal a dispersive spin excitation continuum with clear upper and lower excitation edges under a weak magnetic field (H = 2.5 T). Moreover, a spectral crossing emerges at the Γ point at the Zeeman-split energy. The corresponding redistribution of the spectral weight and its field-dependent evolution are consistent with the theoretical prediction based on the inter-band and intra-band spinon particle-hole excitations associated with the Zeeman-split spinon bands, implying the presence of fractionalized excitations and spinon Fermi surfaces in the partially magnetized QSL state in YbMgGaO4.

Date: 2018
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DOI: 10.1038/s41467-018-06588-1

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