
In the vast field of materials science, two-dimensional (2D) material has long been a focal point of cutting-edge research. Since the discovery of single-layer graphene in 2004—an event akin to dropping a massive stone into a calm lake, sending ripples in all directions—the family of 2D materials has rapidly expanded. To date, hundreds of experimentally accessible 2D materials have been identified. However, for a long time, these 2D materials were largely confined to layered material systems. Metals, which hold a…