  The search for new topological materials and states of matter is presently at
the forefront of quantum materials research. One powerful approach to novel
topological phases beyond the thermodynamic space is to combine different
topological/functional materials into a single materials platform in the form
of superlattices. However, despite some previous efforts, there has been a
significant gap between theories and experiments in this direction. Here, we
provide the first detailed set of experimentally-verifiable phase diagrams of
topological superlattices composed of archetypal topological insulator (TI),
Bi$_{2}$Se$_{3}$, and normal insulator (NI), In$_{2}$Se$_{3}$, by combining
molecular-level materials control, low-temperature magnetotransport
measurements, and field theoretical calculations. We show how the electronic
properties of topological superlattices evolve with unit-layer thicknesses and
utilize the weak antilocalization effect as a tool to gain quantitative
insights into the evolution of conducting channels within each set of
heterostructures. This orchestrated study opens the door to the possibility of
creating a variety of artificial-topological-phases by combining topological
materials with various other functional building blocks such as superconductors
and magnetic materials.
