Synthesis is the bridge linking scientific fantasies to practical realizations, to push the boundaries of materials exploration with societally impactful applications.As one of the most promising classes of materials with direct technological implications, complex oxides exhibit an amazing collection of electronic, chemical, ionic and topological properties, making them strategic candidates for a variety of electronic, energy and environmental technologies [1].Tremendous advances in thin-film growth technology over the past decades have led to effective control of structures and compositions during deposition so that even individual atomic layers can be robustly manipulated, for example by molecular beam epitaxy or pulsed laser deposition.