Phase separation in the particle-hole asymmetric Hubbard model

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Phase separation in the particle-hole asymmetric Hubbard model

The paramagnetic phase diagram of the Hubbard model with nearest-neighbor and next-nearest-neighbor NNN hopping on the Bethe lattice is computed at half-filling and in the weakly doped regime using the self-energy functional approach for dynamical mean-field theory. NNN hopping breaks the particle-hole symmetry and leads to a strong asymmetry of the electron-doped and hole-doped regimes. Phase ...

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Segregation in the Asymmetric Hubbard Model

We study the ‘asymmetric’ Hubbard model, where hoppings of electrons depend on their spin. For strong interactions and sufficiently asymmetric hoppings, it is proved that the ground state displays phase separation away from half-filling. This extends a recent result obtained with Freericks and Lieb for the Falicov-Kimball model. It is based on estimates for the sum of lowest eigenvalues of the ...

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ژورنال

عنوان ژورنال: Physical Review B

سال: 2007

ISSN: 1098-0121,1550-235X

DOI: 10.1103/physrevb.75.125103