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The extraordinary properties of the Kitaev model have motivated an intensesearch for new physics in materials that combine geometrical and bondfrustration. In this work, we employ inelastic neutron scattering, spin wavetheory, and exact diagonalization to study the spin dynamics in the perfecttriangular-lattice antiferromagnet (TLAF) CsCeSe$_2$. This material orders intoa stripe phase, which is demonstrated to arise as a consequence of theoff-diagonal bond-dependent terms in the spin Hamiltonian. By studying the spindynamics at intermediate fields, we identify an interaction between thesingle-magnon state and the two-magnon continuum that causes decay of coherentmagnon excitations, level repulsion, and transfer of spectral weight to thecontinuum that are controlled by the strength of the magnetic field. Ourresults provide a microscopic mechanism for the stabilization of the stripephase in TLAF and show how complex many-body physics can be present in the spindynamics in a magnet with strong Kitaev coupling even in an ordered groundstate.

Quantum spin dynamics due to strong Kitaev interactions in the triangular-lattice antiferromagnet CsCeSe$_2$