Fractional quantum anomalous Hall states in twisted bilayer MoTe${}_2$ and WSe${}_2$

Abstract

We demonstrate via exact diagonalization that AA-stacked TMD homobilayers host fractional quantum anomalous Hall (FQAH) states with fractionally quantized Hall conductance at fractional fillings $n=\frac{1}{3},\frac{2}{3}$ and zero magnetic field. While both states are most robust at angles near $\theta \approx 2^{\circ }$, the $n=\frac{1}{3}$ state gives way to a charge density wave with increasing twist angle whereas the $n=\frac{2}{3}$ state survives across a much broader range of twist angles. We show that the competition between FQAH states and charge density wave or metallic phases is primarily controlled by the wavefunctions and dispersion of the underlying Chern band, respectively. Additionally, Ising ferromagnetism is found across a broad range of fillings where the system is insulating or metallic alike. The spin gap is enhanced at filling fractions where integer and fractional quantum anomalous Hall states are formed.

Journal version (PRB, Editor's suggestion). Supplementary Material added. Main: 10 pages, 9 figures. SM: 8 pages, 5 figures

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