1. School of Physics and Electronic Information, Shangrao Normal University, Shangrao 334000, China
2. Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3. Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile
4. Department of Physics, National Technical University of Athens, 15780 Athens, Greece