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We report terahertz spectroscopic measurements of quantum spin dynamics inthe spin-1/2 honeycomb magnet Na$_2$Co$_2$TeO$_6$ as a function of appliedmagnetic field with different terahertz polarizations. Distinct fielddependencies of the resolved spin dynamics are identified in three regimes,which are separated by two critical fields at $B_{c1}\approx 7$ and$B_{c2}\approx 10$ T. A polarization selective continuum is observed in theintermediate phase, featuring spin fluctuations of a proximate quantum spinliquid.

Field and Polarization Dependent Quantum Spin Dynamics in Honeycomb Magnet Na$_2$Co$_2$TeO$_6$: Magnetic Excitations and Continuum