2024/10/22 by Henri Menke, Niklas Enderlein, Menke, Henri +11
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Silicon Carbide Semiconductor Technologies #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity in MgB2 and Alloys
paper · doi:10.48550/arxiv.2410.17165
openalex publication_date 2024/10/22 · openalex created_date 2024/11/13 · openalex updated_date 2026/07/28
We propose three transition-metal adatom systems on SiC surfaces as a versatile platform to realize massless Dirac fermions and flat bands with strong electronic correlations. Using density functional theory combined with the constrained random phase approximation and dynamical mean-field theory, we investigate the electronic properties of Ti, V, and Cr adatoms. The triangular surface lattices exhibit narrow bandwidths and effective two-band Hubbard models near the Fermi level, originating from partially filled adatom d orbitals. For the undoped systems our calculations reveal two distinct Mott insulating ground states. While the V lattice is a paramagnetic textbook case with large local moments, the Cr lattice, in contrast, is on the edge of a phase transition toward a flat-band Fermi liquid. The Ti lattice realizes a heavy Dirac semimetal at zero doping.