Novel tetradymite-based magnetic topological materials and interfaces.

Rich physical phenomena arise at novel magnetic topological surfaces and interfaces, which have become a highly pursued forefront for quantum science and technology. Major breakthroughs have been propelled by ever improving capabilities of realizing and manipulating, at the atomic level, unprecedented quantum behavior when emerging magnetic order, tunable spin-orbit coupling and topologically nontrivial states cooperate. In this review, we focus on interface-modulated magnetism in tetradymite-based magnetic topological insulators and semimetals. We highlight nontrivial spin textures and dynamics that are enabled by synergy of complex crystalline phases, competing orders, engineered defects and symmetry breaking. We envision deeper understanding of interfacially coupled magnetism and topology to further boost fundamental discoveries and technological breakthroughs.