Authors
Henri Menke, Niklas Enderlein, Roland Gillen, Yi-Ting Tseng, Michel Bockstedte, Janina Maultzsch, Giorgio Sangiovanni, Philipp Hansmann
Published in
Physical review letters. Volume 136. Issue 24. Pages 246503. Jun 19, 2026.
Abstract
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.
PMID:
42412456
Bibliographic data and abstract were imported from PubMed on 07 Jul 2026.
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