What Has Been Achieved:
We demonstrate large-area, environmentally stable, single-crystal 2D gallium, indium and tin that are stabilized at the interface of epitaxial graphene and silicon carbide. The 2D metals are covalently
bonded to SiC below but present a non-bonded interface to the graphene overlayer; that is, they are ‘half van der Waals’ metals with strong internal gradients in bonding character.
Importance of Achievement:
These non-centrosymmetric 2D metals offer compelling opportunities for superconducting devices, topological phenomena and advanced optoelectronic properties.
Unique Features of the MIP That Enabled Project:
The 2DCC provided expertise in theory to help understand the origin of the physical phenomena.
Publication: Nature Materials (2020) https://doi.org/10.1038/s41563-020-0631-x
Funding for this work was also provided by the Northrop Grumman Mission Systems’ University Research Program, Semiconductor Research Corporation Intel/Global Research Collaboration Fellowship Program, task 2741.001, National Science Foundation (NSF) CAREER Awards 1453924 and 1847811, the Chinese Scholarship Council, an Alfred P. Sloan Research Fellowship, NSF DMR-1708972 and 1808900, and the 2D Crystal Consortium NSF Materials Innovation Platform under cooperative agreement DMR-1539916. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility, and at the Pennsylvania State University Materials Research Institute’s Material Characterization Laboratory. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231