The triangular-lattice quantum Ising antiferromagnet is a promising platform for realizing Anderson's quantum spin liquid, though finding suitable materials to realize it remains a challenge. Here, we present a comprehensive study of ${\mathrm{NaTmSe}}_2$ using magnetization, specific heat, neutron scattering, and muon spin relaxation, combined with theoretical calculations. We demonstrate that ${\mathrm{NaTmSe}}_2$ realizes the transverse field Ising model and quantitatively determine its exchange parameters. Our results reveal a multipolar spin-polarized state coexisting with a dipolar spin-disordered state. These states feature gapless spinon excitations mediated by the multipolar moments. The study shows how multiple types of magnetism can emerge in distinct magnetic channels (dipolar and multipolar) within a single magnet, advancing our understanding of spin-frustrated Ising physics and opening pathways for different quantum computing applications.

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• Frustrated magnetism
• Spinon
• Antiferromagnets
• Triangular lattice
• Crystal growth
• Crystal-field theory
• Density matrix renormalization group
• Energy-dispersive x-ray spectroscopy
• Exact diagonalization
• Inelastic neutron scattering
• Ising model
• Magnetization measurements
• Muon spin relaxation & rotation
• Neutron diffraction
• Neutron techniques
• Specific heat measurements
• Spin wave theory
• X-ray diffraction