Tuning electronic interaction in twisted multilayer graphene family

The superconductivity (SC) in twisted trilayer graphene (TTG) shows intriguing features that are not shown in twisted bilayer graphene (TBG), indicating a possibly different pairing mechanism from TBG. One can shed light on the pairing mechanism by investigating the dependence of SC on electronic interactions in TTG. However, it is challenging to control displacement field D with fixed interaction level. In this work, we study the effect of ε-tuning on twisted multilayer graphene. Latest experimental results will be discussed and compared to various theoretical models.