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Layered $\alpha$-RuCl3 has been discussed as a proximate Kitaev spin liquidcompound. Raman and THz spectroscopy of magnetic excitations confirm that thelow-temperature antiferromagnetic ordered phase features a broad Ramancontinuum, together with two magnon-like excitations at 2.7 and 3.6 meV,respectively. The continuum strength is maximized as long-range order issuppressed by an external magnetic field. The state above the field-inducedquantum phase transition around 7.5 T is characterized by a gappedmulti-particle continuum out of which a two-particle bound state emerges,together with a well-defined single-particle excitation at lower energy. Exactdiagonalization calculations demonstrate that Kitaev and off-diagonal exchangeterms in the Fleury-Loudon operator are crucial for the occurrence of thesefeatures in the Raman spectra. Our study firmly establishes thepartially-polarized quantum disordered character of the high-field phase.

High-Field Quantum Disordered State in $\alpha$-RuCl3: Spin Flips, Bound States, and a Multi-Particle Continuum