Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.16: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Competition of FCI and CDW in a Two-Band Model — •Marco Schönleber and Maria Daghofer — Institut für Funktionelle Materie und Quantentechnologien, Stuttgart, Deutschland

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 = 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 and DMRG. By varying band gap and interaction strength the topologically non-trivial FCI competes with the symmetry-broken CDW phase.

Keywords: Fractional Chern insulator; Charge density wave; FQAH