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Yuan-Ming Lu, The Ohio State University

The discovery of topological insulators revealed a large class of topological materials, which exhibit novel surface states with unusual properties. I will discuss some recent progress in engineering surface states of topological materials, focusing on two different systems. The 1^{st} class of materials is three-dimensional Dirac semimetals including Na3Bi and Cd3As2, whose topological surface states can be deformed in these materials by either doping or applying mechanical strain. The 2^{nd} class of materials are spin-orbit coupled quantum magnets, which can host topological magnon surface states robust again disorders. I’ll discuss the zigzag magnetic order in layered \alpha-RuCl3 as one example, where chiral magnon surface states can be achieved by applying magnetic field.