The Cha research group focuses on synthesis and transport measurements of two-dimensional layered nanochalcogenides, in particular topological insulator nanoribbons and nanoplates. The group uses analytical scanning transmission electron microscopy and electron energy-loss spectroscopy to investigate the fundamental structure-property relationships of the synthesized nanomaterials for novel electronic, photonic, and plasmonic properties. Other chalcogenide systems are also investigated for energy applications.