Magnetic Resonance reveals quantum critical fan

Yu-Hsuan, Cameron, Igor’s and former REU student Tianna performed extensive studies on TmVO₄, and discovered that the NMR signal is wiped out in the quantum critical regime in this material that is a prototypical exam for the transverse field Ising model. In this case, the order parameter is ferroquadrupolar order of the Tm 4f orbitals, which can be suppressed in a magnetic field. This material also captures the basic physics of a qubit coupled to a quantum critical environment that has been studied extensively by the quantum information community. This work has been published in Physical Review Letters.