| Title | Exciton moire potential in twisted WSe2 homobilayers modulated by electric field |
| Authors | Shi Bei-Bei Tao Guang-Yi Dai Yu-Chen He Xiao Lin Feng Zhang Han Fang Zhe-Yu |
| Affiliation | Peking Univ, State Key Lab Artificial Microstruct & Mesoscop P, Sch Phys, Beijing 100871, Peoples R China |
| Keywords | DIRAC FERMIONS WAALS |
| Issue Date | 5-Sep-2022 |
| Publisher | ACTA PHYSICA SINICA |
| Abstract | The nanoscale periodic energy potential is introduced by moire pattern in two stacked transition metal dichalcogenide monolayers with lattice mismatch or crystal orientation misalignment. It is demonstrated that the moire potential can act as a diffusion barrier that affects interlayer exciton transport, providing an opportunity for studying the electronic and optical properties of moire excitons. However, the current research on the modulation of exciton moire potential in twisted homobilayers is limited. In this paper the effect of externally applied perpendicular electric field on the exciton moire potential in twisted WSe2 homobilayers with different rotation angles is studied by using first principle calculations. It is found that the amplitude and shape of the interlayer exciton moire potential are dependent on the relative rotation angle between the layers and electric field intensity. The amplitude and shape of the moire potential in the twisted WSe2 homobilayers with different rotation angles vary with the electric field intensity (<= 1 V/nm). These results provide theoretical basis and data prediction for modulating the local and the non-local transition of interlayer excitons, and are of great significance in promoting the development of semiconductor devices such as artificial excitonic crystals and nanoarray lasers. |
| URI | http://hdl.handle.net/20.500.11897/658366 |
| ISSN | 1000-3290 |
| DOI | 10.7498/aps.71.20220664 |
| Indexed | EI SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 |
