[1] Flinders Univ S Australia, ARC Ctr Excellence Antimatter Matter Studies, Adelaide, SA 5001, Australia
[2] Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 USA
[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[4] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
[5] Swinburne Univ Technol, EChem Lab, Fac Life & Social Sci, Melbourne, Vic 3122, Australia
[6] Univ Sunshine Coast, Maroochydore, Qld 4558, Australia
[7] Univ Malaya, Inst Math Sci, Kuala Lumpur 50603, Malaysia