Phase Separation in Hubbard Model |
| J.H. Samson Department of Physics, Loughborough University, Loughborough, Leics LE11 3TU, United Kingdom |
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| 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-, half- and three-quarter-filling. For large U this occurs at hole (or electron) doping of (3t/π2U)1/3 from half-filling. |
| DOI: 10.12693/APhysPolA.92.363 PACS numbers: 75.10.Lp, 75.25.+z |