Kai Yuen Lee is a first-year PhD student in Professor Yan's group at Chinese University of Hong Kong (CUHK). Kai Yuen's current research focuses on Quantum Monte Carlo simulations of mesoscopic systems of unitary Fermi gases. Additionally, he is investigating the in-phase and out-of-phase breathing modes of two-species sodium-rubidium Bose–Einstein condensates (BECs), exploring novel phenomena in their excitation frequencies relative to interspecies interaction strength.