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Fig. 1: Crystal and electronic structures of bulk single-crystal GdMn6Sn6. 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...
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 ...
A kagome lattice tight-binding model generically features a Dirac crossing and a flat-band, which are the fundamental sources of nontrivial topology and strong correlation. Such topological fermionic structures arising from the correlated 3d electrons in the kagome lattice have been widely reported in...
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 ...
originalHaldanemodelsuchascheckerboardIattice、kagomelaltice、LieblatticeandstarlatliceetalInrecentyearsitisnoteworthythattopologicalfiatbands(TFBs}withnonzeroChemnumbershavebeenproposedinsome2Dlattices)stemsTheproposalsofTFBspointoutapossiblenewa、enuetorealizetheFQItEInIbisarticle,wewillstudythetight-bindingelectronic...
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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...
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, ...
21with large intrinsic anomalous Hall effect. Kagome lattices have also long been an interest in terms of band structure. Single orbital tight-binding model gives a band structure which shows a coexistence of a couple of interesting features: topological physics associated with Dirac points in the ...