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• W2945549976 abstract "We study the infinite-U Hubbard model on ladders of 2, 4 and 6 legs with nearest (t) and next-nearest (t') neighbor hoppings by means of the density-matrix renormalization group algorithm. In particular, we analyze the stability of the Nagaoka state for several values of t' when we vary the electron density $(rho)$ from half-filling to the low-density limit. We build the two-dimensional phase diagram, where the fully spin-polarized and paramagnetic states prevail. We find that the inclusion of a non-frustrating next nearest neighbor hopping stabilizes the fully spin-polarized phase up until |t'/t|=0.5. Surprisingly, for this value of t', the ground state is fully spin-polarized for almost any electron density 1 $gtrsim rho gtrsim$ 0, connecting the Nagaoka state to itinerant ferromagnetism at low density. Also, we find that the previously found checkerboard insulator phase at t'=0 and $rho$=0.75 is unstable against t'." @default.
• W2945549976 created "2019-05-29" @default.
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• W2945549976 date "2019-05-14" @default.
• W2945549976 modified "2023-10-06" @default.
• W2945549976 title "Magnetic phase diagram of the infinite- U Hubbard model with nearest- and next-nearest-neighbor hoppings" @default.
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• W2945549976 doi "https://doi.org/10.1103/physrevb.99.174411" @default.
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