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Quantum spin liquids (QSLs) are exotic states of matter characterized byemergent gauge structures and fractionalized elementary excitations. Therecently discovered triangular lattice antiferromagnet YbMgGaO$_4$ is apromising QSL candidate, and the nature of its ground state is still underdebate. Here, we use neutron scattering to study the spin excitations inYbMgGaO$_4$ under various magnetic fields. Our data reveal a dispersive spinexcitation continuum with clear upper and lower excitation edges under a weakmagnetic field ($H=2.5$ T). Moreover, a spectral crossing emerges at the$\Gamma$ point at the Zeeman-split energy. The corresponding redistribution ofthe spectral weight and its field-dependent evolution are consistent with thetheoretical prediction based on the inter-band and intra-band spinonparticle-hole excitations associated with the Zeeman-split spinon bands,implying the presence of fractionalized excitations and spinon Fermi surfacesin the partially magnetized YbMgGaO$_4$.

Fractionalized excitations in the partially magnetized spin liquid candidate YbMgGaO4