Magnetic control of van der Waals materials using light-phonon interaction

A high level of quantum control of correlated materials can be achieved through light-matter interactions. In this talk, I will discuss how phonon-photon interactions combined with nonlinear phonon-phonon coupling gives rise to a generic approach to engineer magnetic exchange interactions, topological electronic phases and magnon topology of van der Waals magnets. I will present a group theory analysis supplemented by first principles calculations on CrI3 and MnBi2Te4 as model systems. In addition, I will also provide generic symmetry and topological considerations for magnon band topology, including magnon nodal lines. Related papers: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.081117 https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00070 Engineering the magnetic exchange anisotropy and magnon topology of bilayer honeycomb lattice using nonlinear phononics (to appear).