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- W2079722104 abstract "The exact phase diagrams of the one-dimensional Hubbard model, both attractive and repulsive, in the presence of an arbitrary magnetic field h for various electron concentrations n and on-site interaction strengths U<0 or U>0 are calculated and investigated. The exact ground-state properties, namely, the ground-state energy, the average spin (magnetization), the concentration of the doubly occupied sites, the kinetic energy, the chemical potential, the spin (magnetic) susceptibility and the charge compressibility, are calculated and examined over a wide range of interaction strengths U for various h and n. It is found that the spin susceptibility at half-filling is non-analytic and changes discontinuously as U→0. The exact theory shows the absence of a charge energy gap in the U⩽0 region for all n and provides, for the chemical potential, the rigorous upper and lower bounds for half-filled and empty bands respectively. The analytical results derived for the weak-coupling limit and asymptotic expansions for strong coupling are in full agreement with the numerical calculations." @default.
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- W2079722104 date "2000-08-02" @default.
- W2079722104 modified "2023-09-27" @default.
- W2079722104 title "Phase transitions and exact ground-state properties of the one-dimensional Hubbard model in a magnetic field" @default.
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- W2079722104 doi "https://doi.org/10.1088/0953-8984/12/33/311" @default.
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