Engineering correlated Dirac fermions and flat bands on SiC with transition-metal adatom lattices
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866914984127102976 |
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| author | Menke, Henri Enderlein, Niklas Tseng, Yi-Ting Bockstedte, Michel Maultzsch, Janina Sangiovanni, Giorgio Hansmann, Philipp |
| author_facet | Menke, Henri Enderlein, Niklas Tseng, Yi-Ting Bockstedte, Michel Maultzsch, Janina Sangiovanni, Giorgio Hansmann, Philipp |
| contents | We propose three transition-metal adatom systems on 3C-SiC(111) 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, localized d-orbitals of the adatoms. Our study reveals a materials trend from a flat band Fermi liquid (Cr) via a paramagnetic Mott insulator with large local moments (V) to a Mott insulator on the verge to a heavy Dirac semimetal (Ti) showcasing the diverse nature of these strongly correlated systems. Specifically, the flat bands in the Cr and the well-defined Dirac cones in the strained metallic~Ti lattice indicate high potential for realizing topological and correlated phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17165 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Engineering correlated Dirac fermions and flat bands on SiC with transition-metal adatom lattices Menke, Henri Enderlein, Niklas Tseng, Yi-Ting Bockstedte, Michel Maultzsch, Janina Sangiovanni, Giorgio Hansmann, Philipp Strongly Correlated Electrons We propose three transition-metal adatom systems on 3C-SiC(111) 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, localized d-orbitals of the adatoms. Our study reveals a materials trend from a flat band Fermi liquid (Cr) via a paramagnetic Mott insulator with large local moments (V) to a Mott insulator on the verge to a heavy Dirac semimetal (Ti) showcasing the diverse nature of these strongly correlated systems. Specifically, the flat bands in the Cr and the well-defined Dirac cones in the strained metallic~Ti lattice indicate high potential for realizing topological and correlated phases. |
| title | Engineering correlated Dirac fermions and flat bands on SiC with transition-metal adatom lattices |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2410.17165 |