Ground-state degeneracy and low-temperat
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A. Honecker; O. Derzhko; J. Richter
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Article
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2009
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Elsevier Science
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English
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Highly frustrated lattices yield a completely flat lowest single-electron band. Remarkably, exact manybody ground states can be constructed for the repulsive Hubbard model and the t2J model by filling this flat band with localized electron states. This construction leads to a macroscopic ground-stat