Condensed matter physics has progressed significantly through the discovery of new materials, new phenomena, and new concepts. A prime example is the research on strongly correlated electron systems, a traditional strength of the Institute for Solid State Physics (ISSP). Breakthroughs often occur at the intersection of various research fields. With this in mind, the Quantum Materials Group was established to foster interdisciplinary studies that enhance collaboration between experimental and theoretical groups, transcending traditional research disciplines. The group comprises two core groups and twelve joint groups, all of which vigorously pursue research to discover novel quantum phases and functional materials in correlated electron/spin systems. Their efforts include synthesizing new materials in bulk and thin-film forms and characterizing them using cutting-edge measurement systems. Additionally, device fabrication is undertaken for spintronics applications. These experimental endeavors are complemented by active discussions and close collaboration with theoretical groups, which employ advanced theoretical approaches and numerical methods to explore new topological phases.