1. Institute of Modern Physics Northwest University Xian 710069 China
2. Shaanxi Key Laboratory for Theoretical Physics Frontiers Xian 710069 China
3. NSFC‐SPTP Peng Huanwu Center for Fundamental Theory Xian 710127 China
4. Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou Guangdong 510006 China
5. School of Physics and Telecommunication Engineering South China Normal University Guangzhou Guangdong 510006 China
6. The Laboratory for Quantum Gravity and Strings Department of Mathematics and Applied Mathematics University of Cape Town Private Bag Rondebosch 7700 South Africa
7. Department of Physics and Center for Theoretical Sciences National Taiwan University Taipei 10617 Taiwan, R.O.C.