Abstract
The creative assembly of van der Waals (vdW) heterostructures gives rise to a variety of intriguing quantum phenomena at the interface, and therefore has attracted intense interests. In particular, it enables unprecedented design of new “artificial” band structures with interesting spin and valley related properties. In this talk, I will present some of our ongoing experimental efforts to engineer and understand new spin-valley physics in graphene-transition metal dichalcogenides (TMDCs) vdW heterostructures and in small-angle-twisted TMDC bilayers. We have established several key techniques to realize clean vdW heterostructures, including fully motorized transfer stage and metal-assisted large-area flake exfoliation techniques, and have carried out basic transport characterizations which showed promising results. To investigate spin-valley physics in the system, we plan to use non-local magnetotransport measurements at low temperatures, such as transverse magnetic focusing and non-local Hall measurement, since they can single-out electrons with certain spin or valley quantum numbers. Note that the transverse magnetic focusing can be further used to probe the shape of the Fermi surface in the system, providing additional information. We believe these studies will allow us to gain profound insights about spin-valley physics in vdW heterostructures.
Anyone interested is welcome to attend.