Time-integrated Four-wave Mixing Measurements on Transition Metal Dichalcogenides in High Magnetic Fields

Monolayer transition metal dichalcogenides are 2D materials with unique optical properties that make them potential candidates for use in optoelectronic devices and even quantum logic gates. We can observe changes in exciton dephasing rate in TMDs under high magnetic fields and use four wave mixing spectroscopy to better understand and manipulate exciton dynamics. Using the MONSTR apparatus, we took FWM measurements of a monolayer MoSe₂ sample, scanning from negative to positive delay signal to analyze the dephasing time of excitons. We applied magnetic fields up to 25T and altered the polarization scheme of the excitation pulses from cross-circular to co-circular to observe the dependence of exciton dephasing rate on these factors. The preliminary data suggests non-Markovian behavior, which can be seen in the broadening of the FWM signal. This may be a result of increased biexciton formation, which we learned may be tuned using a magnetic field. In the future, the application of a magnetic field onto heterostructure TMDs may also provide interesting insights, particularly into the dynamics of interlayer excitons.