Department of Mechanics, Hunan University, Changsha 410082, China;
Department of Physics, Shaoyang Teacher's College, Shaoyang 422000, China;
Department of Mechanics, Hunan University, Changsha 410082, China;
Department of Mechanics, Hunan University, Changsha 410082, China;
Department of Physics, Hunan Normal University, Changsha 410082, China;
Department of Physics, Hunan Normal University, Changsha 410082, China;
nonlinear Schrodinger equation; chaos; bifurcation;