WebAug 5, 2024 · In the limit where the nearly flat bands become completely dispersionless, we have shown that the flat bands are non-singular and their Landau levels do not show any spreading (Supplementary Fig ... WebFeb 26, 2013 · One important factor to the stability of FCIs in this system is due to the ideal geometry of the flatbands in the fixed point chiral limit [12,13], where each flatband's Berry curvature Ω k is...
The origin of a flat band Request PDF - ResearchGate
WebJun 1, 2024 · Unlike the partial loose flat band found in the twisted bilayer graphene, the flat band in this system is strictly E k,0 = 0 in the full Brillouin zone. In the strong interaction limit when U is large, to exclude the doubly occupied state, the effective t – J model is given by , where P G = ∏ i (1 – n i ↑ n i ↓ ) is the Gutzwiller ... WebJan 14, 2024 · Flat-band materials, especially those that have topological electronic flattened bands near or at the Fermi level, are prime candidates for hosting strongly-correlated electrons (16) and can... svijet medija pula
Flat-band ferromagnetism in a topological Hubbard model
WebFeb 1, 2024 · The flat bands at both λ / t = 0 and −2 touch the other dispersive bands at Γ-point. This band touching is neither an accidental degeneracy nor a typical symmetry-protected band... WebMar 8, 2024 · Flat bands play an important role in diffraction-free photonics and attract fundamental interest in many-body physics. Here we report the engineering of flat … WebMar 26, 2024 · A basic idea is that flat bands, arising from quantum mechanical interference, give unique opportunities for enhancing TC with (i) many pair-scattering channels between the dispersive and flat bands, and (ii) an even more interesting situation when the flat band is topological and highly entangled. basant catering