Abstract
Due to the ultimate 2D nature of electron transport, graphene layers have provided a unique platform to investigate and engineer various quantum transport phenomena. Here, I will overview our past and ongoing efforts in this direction. First, I will discuss how we tune interlayer coupling in graphene moiré systems to explore new moiré physics [1]. Second, we will demonstrate that the van der Waals (vdW) interaction with semiconducting transition metal dichalcogenides (TMDCs) can induce strong spin-orbit coupling in graphene while keeping the graphene’s excellent transport properties [2]. Lastly, we will discuss our on-going works on cavity-coupled graphene and show that vacuum fluctuations can strongly modify quantum-Hall transport in the system [3]. Financial supports from the MOST China (2020YFA0309600) and the UGC/RGC of Hong Kong SAR (AoE/P-701/20, C7037-22G, 17300020, 17300521, 17309722, and 17301424) are acknowledged.

References
[1] Y. Wang, H. Xue, X. Wang, K. Watanabe, T. Taniguchi, and D.-K. Ki*, Phys. Rev. Lett. 133, 186301 (2024).

[2] Q. Rao et al., Nat. Commun. 14, 6124 (2023).

[3] H. Xue et al., ArXiv e-prints, arXiv:2506.21409 (2025).