Evolution of Moiré Superlattice under Magnetic Field

Liu Wei-Tung^1*, Naoya Kawakami¹, Yen-Yu Lai¹, Duxing Hao², Wen-Hao Chang³, Yu-Chen Chang³, Chen-Hsuan Lu⁴, Tilo H. Yang³, Ming-Hao Liu⁵, Ting-Hua Lu³, Yann-Wen Lan³, Nai-Chang Yeh^2,3,6, Chun-Liang Lin¹

¹Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
²Department of Physics, California Institute of Technology, Pasadena, California, USA
³Department of Physics, National Taiwan Normal University, Taipei, Taiwan
⁴Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California, USA
⁵Department of Physics, National Cheng Kung University, Tainan, Taiwan
⁶Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California, USA

* Presenter:Liu Wei-Tung, email:25875522liu@gmail.com

Two-dimensional materials with atomic-scale thickness, possessing unique electrical, magnetic, and mechanical properties. Represented by graphene and transition metal dichalcogenides, they exhibit characteristics such as high carrier mobility and tunable bandgaps [1]. Furthermore, the twisting and lattice mismatch between two stacked monolayers can induce Moiré superlattices, which offers an additional degree of freedom to alter material properties, including unconventional superconductivity, coupled spin-valley states, and quantized interlayer excitons are correlated to the electronic superlattices [2].
In this work, we study Moiré superlattice of monolayer MoS₂ on highly ordered pyrolytic graphite (HOPG) at 4.5 K under magnetic field by scanning tunneling microscopy (STM). The results clearly showed evolving Moiré superlattices changed for two different regions with various twist angle, which origin from the MoS₂ lattice variation as different magnetic field applied [3]. Our study is the very first discovery on this fascinated phenomenon, it not only reveals a new prospect of structural manipulation in two-dimensional materials, but also give rise to considerable approaches for future applications on multiple devices.

Keywords: transition metal dichalcogenides, polarization , Moiré superlattice