1. School
of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, United States
4. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan