1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4075, Australia
4. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
5. Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
6. Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China