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Physicists uncover new state of matter called quantum spin liquid | This discovery could open doors for further discoveries in fundamental and quantum physics.
Quantum fluctuations in frustrated magnets are expected to produce unconventional emergent behaviour. Neutron spectroscopy measurements now provide evidence for emergent gauge fields in a pyrochlore spin ice.
However, in frustrated magnets it remains difficult to establish convincing experimental evidence for quantum spin liquid ground states and their fractional excitations. We find a gapped spectrum that features a threshold and peaks that match theories for pair production and propagation of fractional matter excitations strongly coupled to a background quantum electrodynamic field. The color maps show the goodness of fit defined in the Methods section, as a function of the dominant and transverse exchange parameters, for different values of the phenomenological peak broadening \(\sigma\) (standard deviation).
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