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It is widely believed that integer quantum Hall systems do not havefractional excitations. Here we show the converse to be true for a class ofsystems where integer quantum Hall effect emerges spontaneously due to theinterplay of itinerant electrons and noncoplanar magnetic ordering. We showthat magnetic $Z_2$ vortices in such systems, whose topological stability isguaranteed by the structure of the order parameter, indeed carry fractionalcharge.

Fractionalization in spontaneous integer quantum Hall systems