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The widely used Double-Exchange model for manganites is shown to supportvarious "striped" phases at filling fractions 1/n (n=3, 4, 5...), in thepreviously unexplored regime of narrow bandwidth and small Jahn-Tellercoupling. Working in two dimensions, our main result is that these stripes canbe individually spin flipped without a physically relevant change in theenergy, i.e., we find a large groundstate manifold with nearly degenerateenergies. The two-dimensional spin system thus displays an unexpecteddynamically generated dimensional reduction into decoupled one-dimensionalstripes, even though the electronic states remain two-dimensional. Relations ofour results with recent literature addressing compass models in quantumcomputing are discussed.

Emergent dimensional reduction of the spin sector in a model for narrow-band manganites