1/4 is the new 1/2 when topology is intertwined with Mottness

Peizhi Mai, Jinchao Zhao, Benjamin E. Feldman and Philip W. Phillips ()
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Peizhi Mai: University of Illinois at Urbana-Champaign
Jinchao Zhao: University of Illinois at Urbana-Champaign
Benjamin E. Feldman: Geballe Laboratory of Advanced Materials
Philip W. Phillips: University of Illinois at Urbana-Champaign

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract In non-interacting systems, bands from non-trivial topology emerge strictly at half-filling and exhibit either the quantum anomalous Hall or spin Hall effects. Here we show using determinantal quantum Monte Carlo and an exactly solvable strongly interacting model that these topological states now shift to quarter filling. A topological Mott insulator is the underlying cause. The peak in the spin susceptibility is consistent with a possible ferromagnetic state at T = 0. The onset of such magnetism would convert the quantum spin Hall to a quantum anomalous Hall effect. While such a symmetry-broken phase typically is accompanied by a gap, we find that the interaction strength must exceed a critical value for this to occur. Hence, we predict that topology can obtain in a gapless phase but only in the presence of interactions in dispersive bands. These results explain the recent quarter-filled quantum anomalous Hall effects seen in moiré systems.

Date: 2023
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DOI: 10.1038/s41467-023-41465-6

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