منابع مشابه
Phase separation in the Hubbard model.
The Hartree-Fock ground-state phase diagram of the one-dimensional Hubbard model is calculated in the μ−U plane, restricted to phases with no charge density modulation. This allows antiferromagnetism, saturated ferromagnetism, spiral spin density waves and a collinear structure with unit cell ↑↑↓↓. The spiral phase is unstable against phase separation near quarter-, halfand three-quarter-fillin...
متن کاملPhase separation in the two-dimensional Hubbard model.
E. Khatami,1,2 K. Mikelsons,1,2 D. Galanakis,1 A. Macridin,3 J. Moreno,1 R. T. Scalettar,4 and M. Jarrell1 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 2Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA 3Fermilab, P.O. Box 500, Batavia, Illinois 60510, USA 4Department of Physics, University of California, Davis, C...
متن کاملPhase 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 ...
متن کاملFerromagnetic Phase Transitions in the Hubbard Model
We show that the coupling of charge and spin density fluctuations in the three-dimensional Hubbard model with total charge fixed severely restricts the occurrence of a continuous ferromagnetic transition. This work focuses in one of a series of longstanding problems related to the one-band Hubbard model [I], namely the existence and nature of a finitetemperature ferromagnetic phase transition i...
متن کاملQuantum criticality and incipient phase separation in the thermodynamic properties of the Hubbard model.
Transport measurements on the cuprates suggest the presence of a quantum critical point (QCP) hiding underneath the superconducting dome near optimal hole doping. We provide numerical evidence in support of this scenario via a dynamical cluster quantum Monte Carlo study of the extended two-dimensional Hubbard model. Single-particle quantities, such as the spectral function, the quasi-particle w...
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ژورنال
عنوان ژورنال: Acta Physica Polonica A
سال: 1997
ISSN: 0587-4246,1898-794X
DOI: 10.12693/aphyspola.92.363