Unconventional gapless semiconductor in an extended martini lattice in covalent honeycomb materials
arXiv:2209.00775 · doi:10.1103/PhysRevB.107.L121301
Abstract
We study characteristic electronic structures in an extended martini lattice model and propose its materialization in -electron networks constructed by designated chemisorption on graphene and silicene. By investigating the minimal tight-binding model, we reveal rich electronic structures tuned by the ratio of hopping parameters, ranging from the band insulator to the unconventional gapless semiconductor. Remarkably, the unconventional gapless semiconductor is characterized by a flat band at the Fermi level. Further, the density functional theory calculations for candidate materials reveal that the characteristic electronic structures can be realized by designated chemisorption or chemical substitution on graphene and silicene, and that the electronic structure near the Fermi level is tunable by the choice of the atomic species of adsorbed atoms. Our results open the way to search exotic electronic structures and their functionalities induced by an extended martini lattice.
6 pages, 4 figures for the main text, 5 pages, 5 figures for Supplemental Material
References in corpus (14)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
- Group-IV graphene- and graphane-like nanosheets
- Geometric characterization of anomalous Landau levels of isolated flat bands
- General construction of flat bands with and without band crossings based on wave function singularity
- Designing flat-band tight-binding models with tunable multifold band touching points
- Flat band, spin-1 Dirac cone, and Hofstadter diagram in the fermionic square kagome model
- Flat bands with band crossings enforced by symmetry representation
- Flat bands in Weaire-Thorpe model and silicene
- Higher-Order Topological Insulator on a Martini Lattice and Its Square Root Descendant
- Revisiting Flat bands and localization
- Line-graph-lattice crystal structures of stoichiometric materials
- Construction of interacting flat-band models by molecular-orbital representation: Correlation functions, energy gap, and entanglement