The Atomic Physics and Optical Science Group consists of 6 Research Fellows and 1 adjunct Research Fellow. The research fields cover: (1) theoretical studies of atomic structures, transition rates, photoionization, atom-atom and electron-atom collisions. (2) Development of novel ultrafast lasers and photonic devices in the femtosecond to attosecond time scale and their applications in: (3) development of tabletop laser-wakefield accelerators, x-ray lasers, plasma nonlinear optics, and plasma photonics devices; (4) development of optical-physics-based methods for growing materials and controlling bio-organisms and their applications. (5) Quantum optics and quantum information science based on cold atoms and solid-state spins in diamond. (6) Theoretical and experimental studies on ultracold atomic gases, including superfluidity, synthetic gauge fields, spinor condensates, and quasi-1D bose gas.
Jyhpyng Wang is working on high-intensity ultrafast laser technology, laser-driven particle accelerators, and relativistic laser-plasma interactions. The principal experimental facility is an advanced 100-TW laser system he developed together with Szu-Yuan Chen in previous joint projects. The Light-Controlled Materials Fabrication and Application Laboratory led by Szu-yuan Chen is working on developing innovative methods based on optical physics for growing materials and controlling bio-organisms, and apply them to energy technology, optoelectronics, and medicine. The core scheme is to apply multiple light sources of various coherences, wavelengths, and pulse durations to achieve coherent control or selective control in a non-equilibrium system, so as to control the growth or transition of materials or bio-organisms in various hierarchical levels.
Ying-Cheng Chen is working on quantum and nonlinear optics based on electromagnetically induced transparency with cold atomic media, as well as their applications to quantum information science including quantum state storage and processing. He is also working on studies of cooperative radiation phenomena such as superradiance with optically dense cold atomic media. Ming-Shien Chang and Yu-Ju Lin are working on experiments of ultracold quantum gases. Ming-Shien Chang focuses his study on the investigation of dynamics and ground state structures of spinor condensates in low dimensional traps, while Yu-Ju Lin is investigating the criteria to superfluidity phenomenon utilizing synthetic gauge fields. Ming-Shien Chang also collaborates with Ying-Cheng Chen and Huan-Cheng Chang on the quantum sensing and quantum optics utilizing ground states spins of nitrogen vacancy centers in fluorescent nanodiamonds. Hsiang-Hua Jen focuses on the theoretical studies of the cooperative spontaneous emissions, chiral quantum emitters, and continuous entanglement entropy. He is also working on the collective effect of dipole-dipole interactions on electromagnetically induced transparency in dense cold atoms and the photonic band structures in 2D cavity-mediated meta-atoms.
The adjunct faculty, Sungkit Yip is devoted to theoretical investigations of superconductivity and ultra-cold atomic gases, especially multi-component systems, superfluidity, quantum magnetism and other strongly correlated phenomena.