Hidden QuadrupolarHidden QuadrupolarExcitations Revealedelusive excitations in quantum magnets.Non-linear spectroscopy uncoversStrongly Correlated ElectronsRevealing Hidden Quadrupolar Excitations in Quantum MagnetsNew technique exposes elusive quadrupolar excitations in quantum systems.2025-07-28T21:13:30+00:00 ― 7 min read