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Estimating the Hubbard repulsion sufficient for the onset of nearly-flat-band ferromagnetism
Hubbard repulsion sufficient onset of nearly-flat-band ferromagnetism
2011/3/2
We consider nearly-flat-band Hubbard models of a ferromagnet, that is the models that are weak perturbations of those flat-band Hubbard models whose ground state is ferromagnetic for any nonzero stren...
Flat band in the core of topological defects: bulk-vortex correspondence in topological superfluids with Fermi points
Flat band topological superfluids Fermi points
2010/11/24
We consider the dimensional crossover in the topological matter, which involves the transformation of different types of topologically protected zeroes in the fermionic spectrum. In the considered cas...
Dimensional crossover in topological matter: Evolution of the multiple Dirac point in the layered system to the flat band on the surface
Dimensional crossover topological matter multiple Dirac point
2010/11/24
We consider the dimensional crossover in the topological matter, which involves the ransformation of different types of topologically protected zeroes in the fermionic spectrum. In the considered case...