Chiral Symmetry and Many-Body Effect in Multilayer Graphene

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Hamamoto, Yuji^1 ; Kawarabayashi, Tohru^2 ; Aoki, Hideo^3 ; Hatsugai, Yasuhiro^1,4

Institute of Physics, University of Tsukuba, Tsukuba 305-8571, Japan^1

Department of Physics, Toho University, Funabashi 274-8510, Japan^2

Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan^3

Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba 305-8571, Japan^4

关键词: Chiral symmetry;    Exact diagonalization method;    Honeycomb lattices;    Many-body effect;    Many-body problems;    Multilayer graphene;    Number of layers;    Spinless electrons;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012013/pdf
DOI  :  10.1088/1742-6596/456/1/012013

来源: IOP

【 摘 要 】

Influence of the chiral symmetry on the many-body problem in multilayer graphene in magnetic fields is investigated. For a spinless electron model on the honeycomb lattice the many-body ground state is shown to be a doubly-degenerate chiral condensate irrespective of the number of layers. The energy spectrum calculated numerically with the exact diagonalization method reveals for ABC-stacked multilayer graphenes that the many-body gap decreases monotonically with the number of layers.