School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, Puerto Rico 00681-9044, USA;