Electronic confinement in quantum dots of twisted bilayer graphene

Electronic properties of quantum dots (QDs) depend sensitively on their parent materials. Therefore, confined electronic states in graphene QDs (GQDs) monolayer and Bernal-stacked bilayer are quite different. Twisted (TBG) is distinct from because the new degree freedom: twist angle. In past few years, numerous efforts have been made to realize GQDs achieved great success. Thus far, however, strategies for realizing TBG elusive. Here, we demonstrate a general approach fabricating stationary by introducing nanoscale p-n junctions with sharp boundaries TBG. We verify confinement low-energy massless Dirac fermions via whispering-gallery modes Unexpectedly, around van Hove singularities also strongly modified GQDs. Such feature has never reported attributed spatial variation interlayer coupling induced