Hexagonal boron nitride (hBN), a polar wide gap insulator, is the gate dielectric of choice in the field of 2D materials. However, surprisingly little is known about how hBN affects the electronic properties of 2D materials of interest. Here, we use nano-ARPES to study the prototypical systems of monolayer transition metal dichalcogenide semiconductors on hBN. Our data show two replica bands...
Two-dimensional materials and heterostructures exhibit correlated phenomena, whose electronic structures are fundamental to the underlying physics. In this talk, I will present our experimental progress on engineering the electronic structure of quantum materials using moiré superlattice potential and time-periodic light fields. In particular, topological flat bands in rhombohedral graphene...
The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked enormous research interest. However, despite the dedication of intensive experimental efforts and the proposal of several possible pairing mechanisms, the origin of its superconductivity remains elusive. In this talk, using angle-resolved photoemission spectroscopy with micrometer spatial...
