PME QUANTUM SPECIAL SEMINAR : Ruolan Xue

Observation of Hydrodynamic Magnon Transport with a Qubit Sensor

The quest for novel probes and the discovery of new physics are central to advancing materials science. Nitrogen-vacancy (NV) centers, which are optically addressable spin qubits, have proven to be versatile nanoscale probes for exploring mesoscopic phenomena, particularly in advancing our understanding of magnetic materials. In this talk, I will present our discovery of magnon hydrodynamics in the atomically thin ferromagnet CrCl₃ using NV magnetometry(arXiv:2403.01057). Our measurement of the decoherence of NV centers is uniquely sensitive to the magnetic noise in CrCl3, leading to the first observation of second sound excitation in 2D magnets. This innovative application of NV centers highlights their unique role within the broader field of magnetometry in materials research.