Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.10: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Influence of Band Mixing on FCI and CDW — •Marco Schönleber and Maria Daghofer — Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany

Fractional quantum hall physics with vanishing magnetic fields has become an increasingly important research topic in recent years due to new findings in the field of moiré materials. Experimental signatures of these phases are often observed in combination with signatures of charge ordered or other symmetry broken phases. This indicates that band mixing might play an elementary role in the complete description of this phase of matter. For this purpose, an extended Hubbard model on a triangular lattice with ν = 1/3 and ν = 2/3 is considered. This allows the formation of bands of non-trivial topology as well as the formation of commensurate charge density waves. The analysis is carried out by exact diagonalisation. By varying the band gap, it can be shown that the stability of the charge order depends on this, whereby the degree of filling plays a decisive role.

Keywords: fractional; Chern; FQAH; CDW