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We explain the appearance of magic angles and fractional Chern insulators intwisted K-valley homobilayer transition metal dichalcogenides by mapping theircontinuum model to a Landau level problem. Our approach relies on an adiabaticapproximation for the quantum mechanics of valence band holes in alayer-pseudospin field that is valid for sufficiently small twist angles and ona lowest Landau level approximation that is valid for sufficiently large twistangles. It simply explains why the quantum geometry of the lowest moir\'eminiband is nearly ideal at particular flat-band twist angles, predicts thattopological flat bands occur only when the valley-dependent moir\'e potentialis sufficiently strong compared to the interlayer tunneling amplitude, andprovides a powerful starting point for the study of interactions

Magic Angles and Fractional Chern Insulators in Twisted Homobilayer TMDs