The coupling of spin and charge in magnetic semiconductors lies at the heart of the field of spintronics and has attracted significant interest for new computing technologies. In this paper, we will review our recent progress in studying and controlling magneto-exciton coupling in the layered antiferromagnetic semiconductor CrSBr. The anisotropic Wannier-type excitons in this material serve as a sensor of the interlayer magnetic coupling. Using this exciton sensor, we found that the magnetic order is extremely tunable by the application of tensile strain, with a reversible AFM to FM transition occurring at large but experimentally feasible strains. These results establish CrSBr as an exciting platform for harnessing spin-charge-lattice coupling to the 2D limit.
This talk will show our recent theoretical and computational studies of new exciton physics in monolayer transition metal dichalcogenides. By developing a first-principle method based on many-body perturbation theories, we find that the photoelectrons from excitons hold unique energy dispersions and spectra weights, which unveil the fundamental physical properties of the excitons. The theoretical findings agree well with the experimentally measured pump-probe photoemission spectra of excitons in monolayer WSe2 (Science 370, 1199 (2020) and Science Advances 7, eabg0192 (2021)). We then demonstrate a valley- and spin-selective excitonic energy relaxation pathway, which leads to novel ultrafast dynamics in monolayer transition metal dichalcogenides. We further connect our theoretical discoveries to experimental results and explore their potential applications.
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