Molecular beam epitaxy of materials interfaces with atomic precision

In this contribution a few selected examples to engineer material interfaces in nanostructured solids with atomic precision by means of molecular beam epitaxy (MBE) are presented. The examples include 2$D$ electron gas systems for quantum transport and mesoscopic physics, quantum cascade lasers, Sb-based materials, ferromagnet-semiconductor heterostructures, as well as oxide materials for electronics and quantum physics. Finally, the prospects to fabricate novel van-der-Waals heterostructures are briefly discussed.