Systematic construction of topological flat-band models by molecular-orbital representation
arXiv:2001.10255 · doi:10.1103/PhysRevB.101.235125
Abstract
On the basis of the "molecular-orbital" representation which describes generic flat-band models, we propose a systematic way to construct a class of flat-band models with finite-range hoppings that have topological natures. In these models, the topological natures are encoded not into the flat band itself but into the dispersive bands touching the flat band. Such a band structure may become a source of exotic phenomena arising from the combination of flat bands, topology and correlations.
9 pages, 7 figures
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- Machine Learning Study on the Flat-Band States Constructed by Molecular-Orbital Representation with Randomness
- Symmetry-Based Real-Space Framework for Realizing Flat Bands and Unveiling Nodal-Line Touchings