[1] Beihang Univ, Sch Phys Nucl Energy Engn, Beijing 100191, Peoples R China
[2] Politecn Torino, Dipartimento Sci Matemat, I-10129 Turin, Italy
[3] Politecn Torino, Graphene Polito Lab, I-10129 Turin, Italy
[4] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[5] Beijing Computat Sci Res Ctr, Beijing 100089, Peoples R China
[6] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China