Department of Modern Physics and Center of Nonlinear Sciences,University of Science and Technology of China, Hefei 230026;
Department of Physics, Shaoguan University, Shaoguan 512005;
Department of Modern Physics and Center of Nonlinear Sciences,University of Science and Technology of China, Hefei 230026;
Department of Physics, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong;
Department of Physics, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong;
Department of Modern Physics and Center of Nonlinear Sciences,University of Science and Technology of China, Hefei 230026;