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We consider a family of twisted graphene multilayers consisting of$n$-untwisted chirally stacked layers, e.g., AB, ABC, etc, with a single twiston top of $m$-untwisted {chirally stacked} layers. Upon neglecting bothtrigonal warping terms for the untwisted layers and the same sublattice hoppingbetween all layers, the resulting models generalize several remarkable featuresof the chiral model of twisted bilayer graphene (CTBG). In particular, theyexhibit a set of magic angles which are identical to those of CTBG at which apair of bands (i) are perfectly flat, (ii) have Chern numbers in the sublatticebasis given by $\pm (n,-m)$ or $\pm (n + m - 1, -1)$ depending on the stackingchirality, and (iii) satisfy the trace condition, saturating an inequalitybetween the quantum metric and the Berry curvature, and thus realizing idealquantum geometry. These are the first higher Chern bands that satisfy (iii)beyond fine-tuned models or combinations of Landau levels. We show that idealquantum geometry is directly related to the construction of fractional quantumHall model wavefunctions. We provide explicit analytic expressions for the flatband wavefunctions at the magic angle in terms of the CTBG wavefunctions. Wealso show that the Berry curvature distribution in these models can becontinuously tuned while maintaining perfect quantum geometry. Similar to thestudy of fractional Chern insulators in ideal $C = 1$ bands, these models pavethe way for investigating exotic topological phases in higher Chern bands forwhich no Landau level analog is available.

Family of ideal Chern flat bands with arbitrary Chern number in chiral twisted graphene multilayers