Atomic and electronic reconstruction at van der Waals interface in twisted 2-D materials

Controlling the interlayer twist angle in two-dimensional (2-D) van der Waals (vdW) heterostructures offers an experimental route to create moire superlattices. One can realize exotic electronic states by adjusting the width of the electronic bands with a tunable moire length scale. However, in the small twist angle regime, vdW interlayer interaction can cause significant structural reconfiguration at the interface, creating the arrays of domain structures. In this talk, we will discuss the atomic reconstruction at twisted vdW interfaces and its effect on electronic structure and electrical transport behavior. Moreover, one can tune the domain topology at the reconstructed interface using 2-D vdW crystals that has lower symmetry. We will discuss the connection between crystal symmetry and tunable domain topology.