Kagome latticesemiconductor surfacesExcitonic properties in the Kagome lattice system, which is produced by quantum wires on semiconductor surfaces, are investigated by using the exact diagonalization of a tight binding model. It is shown that due to the existence of flat bands the binding energy of...
Here, we introduce the kagome-lattice tight-binding model with a singled-orbital of each vanadium site (A, B, or C) shown in Fig.1a. (Thed-orbital belongs tob3gof theD2hpoint group at V site, while its representation is not essential here). The kinetic term is given by{\hat{H}}_...
The layered system LaRu3Si271,72,73,74,75is another good example of a material hosting both a kagome lattice and superconductivity. The structure of LaRu3Si2contains distorted kagome layers of Ru sandwiched between layers of La and layers of Si having a honeycomb structure (see Fig.1e and h...
aThe crystal structure of GdMn6Sn6. Kagome lattice structure formed by Mn (blue) atoms in the a-b plane, sandwiched between Gd (black) and Sn (red) atoms.bThe sketch illustrates the tight-binding (TB) model on a kagome lattice with nearest-neighbor (NN) in-plane hopping.cSchematic 2D ...
wewillstudythetight-bindingelectronicpeculiarpropertiesonthe2Dkagomelattice.mainbOlllhepropertyoftheenergyspectrum,thedensit2ofstatestheHallconductanceaswellasIheedge—statespectrumetalFirstly.werevisitthebasicpropeaiesoflhetight—bindingelectronsonthekagomelattice,nexttheelectronicpropertiesisdiscussedunderthetwostaggered...
Excitonic properties in the Kagome lattice system, which is produced by quantum wires on semiconductor surfaces, are investigated by using the exact diagonalization of a tight binding model. It is shown that due to the existence of flat bands the binding energy of exciton becomes remarkably large ...
We theoretically study the topological properties of the tight-binding model\non the breathing kagome lattice with antisymmetric spin-orbit coupling (SOC)\nbetween nearest neighbors. We show that the system hosts nontrivial topological\nphases even without second-nearest-neighbor hopping, and that the...
A. kagomeD. specific heatD. paramagnetic susceptibilityWe compute the thermodynamic properties and density of states of disordered kagome lattice doped with impurity atoms in the context of tight binding model Hamiltonian due to spin鈥搊rbit coupling. The effect of scattering by dilute charged ...
flat band (FB 2). As predicted by tight-binding model on kagome lattice3,6, the flat band degenerates with the quadratic band bottom at Γ with the exclusion of SOC. The electron-like band extends to theKpoint and forms Dirac cone aboveEF(see Fig.4a). With the inclusion of SOC, ...
Figure 2a, b show exemplary DFT bands of KV3Sb5 with archetypal kagome bands distilled by our tight-binding theory (see Methods for the details of the TB model). In Fig. 2b, the divergence of the density of states (DOS) is clearly observed at E = −6( + 9) meV. A ...