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Special Issue:
SPECIAL TOPIC — Valleytronics
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Moiré Dirac fermions in transition metal dichalcogenides heterobilayers |
| Chenglong Che(车成龙), Yawei Lv(吕亚威)†, and Qingjun Tong(童庆军)‡ |
| School of Physics and Electronics, Hunan University, Changsha 410082, China |
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Abstract Monolayer group-VIB transition metal dichalcogenides (TMDs) feature low-energy massive Dirac fermions, which have valley contrasting Berry curvature. This nontrivial local band topology gives rise to valley Hall transport and optical selection rules for interband transitions that open up new possibilities for valleytronics. However, the large bandgap in TMDs results in relatively small Berry curvature, leading to weak valley contrasting physics in practical experiments. Here, we show that Dirac fermions with tunable large Berry curvature can be engineered in moiré superlattice of TMD heterobilayers. These moiré Dirac fermions are created in a magnified honeycomb lattice with its sublattice degree of freedom formed by two local moiré potential minima. We show that applying an on-site potential can tune the moiré flat bands into helical ones. In short-period moiré superlattice, we find that the two moiré valleys become asymmetric, which results in a net spin Hall current. More interestingly, a circularly polarized light drives these moiré Dirac fermions into quantum anomalous Hall phase with chiral edge states. Our results open a new possibility to design the moiré-scale spin and valley physics using TMD moiré structures.
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Received: 31 May 2023
Revised: 24 July 2023
Accepted manuscript online: 10 August 2023
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PACS:
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73.90.+f
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(Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures)
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68.65.Cd
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(Superlattices)
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68.65.-k
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(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
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05.30.Rt
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(Quantum phase transitions)
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| Fund: Project supported by the Science Fund for Distinguished Young Scholars of Hunan Province (Grant No. 2022J10002), the National Key Research and Development Program of China (Grant No. 2021YFA1200503), and the Fundamental Research Funds for the Central Universities from China. |
Corresponding Authors:
Yawei Lv, Qingjun Tong
E-mail: lvyawei@hnu.edu.cn;tongqj@hnu.edu.cn
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Cite this article:
Chenglong Che(车成龙), Yawei Lv(吕亚威), and Qingjun Tong(童庆军) Moiré Dirac fermions in transition metal dichalcogenides heterobilayers 2023 Chin. Phys. B 32 107307
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