| TI | Topological insulator |
| TCI | Topological crystalline insulator |
| QL | Quintuple-layer |
| SL | Septuple-layer |
| DFT | Density functional theory |
| VASP | Vienna Ab-initio Simulation Package |
| PBE | Perdew–Burke–Ernzerhof |
| ARPES | According to the angle-resolved photoemission spectroscopy |
| BZ | Brillouin zone |
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