| Time：1131211 (Wed.) 14:20~16:20 Speaker：Prof.梁韋盛(Leong, Wui-Seng) 國立臺灣大學物理學系/Department of Physics, National Taiwan University Title：Fast quantum gas formation via electromagnetically induced transparency cooling Abstract：Ultracold quantum gases play a pivotal role in many-body physics, quantum sensing and quantum simulation. Over time, methods like evaporative cooling in bulk ensembles and precision laser cooling techniques have been employed to effectively achieve quantum degeneracy in atomic gases. The pursuit of a simpler and more rapid way to form quantum gases thus holds significant promise in advancing the field. Here, we report the creation of a quantum gas by cooling individual rubidium atoms pinned in a three-dimensional optical lattice using electromagnetically induced transparency and adiabatic expansion. After just ten milliseconds of cooling, we verify the phase transition from thermal to quantum gas by adiabatically transferring the atoms to optical dipole traps. We observe the collapse of atoms in three-dimensional traps, a distinctive hallmark of a quantum gas with negative scattering length. Additionally, in a one-dimensional optical trap, we observe the emergence of a stable and strongly correlated quantum gas. Our results introduce a versatile and fast approach to achieving quantum degenerate gases with minimal time and resource requirements. Place：B101, Gongguan Campus, NTNU |
