Investigating momentum and spatially resolved view of two-dimensional material-based systems utilizing focused angle-resolved photoemission spectroscopy

Two-dimensional (2D) materials offer the freedom to create novel condensed matter systems, with unique properties, by mechanically assembling different (or same) 2D materials layer-by-layer to form atomically sharp vertical or lateral heterostructures. The van der Waals (vdW) heterostructures with small lattice mismatch and a relatively small twist angle between the constituent layers, have shown to exhibit coexisting complex phases of matter including Mott insulating state, superconductivity, bound quasiparticles, and topological states. The advent of the state-of-the-art angle-resolved photoemission spectroscopy with high spatial resolution (micro- and nano-ARPES) and the ability to perform these measurements on fully functional devices, has made it possible to directly probe many exotic physical phenomena in 2D based material systems [1, 2]. In this talk, I will discuss the utilization of the in-operando nanoARPES to investigate the highly tunable many-body effects in graphene and twisted bilayer graphene devices [3, 4].