Spiral ferrimagnetic phases in the two-dimensional Hubbard model
| Autor: | Gouveia, J. D., Dias, R. G. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | J.D. Gouveia, R.G. Dias, Spiral ferrimagnetic phases in the two-dimensional Hubbard model, Solid State Communications, Volume 185, May 2014, Pages 21-24, ISSN 0038-1098, http://dx.doi.org/10.1016/j.ssc.2014.01.004 |
| Druh dokumentu: | Working Paper |
| Popis: | We address the possibility of spiral ferrimagnetic phases in the mean-field phase diagram of the two-dimensional (2D) Hubbard model. For intermediate values of the interaction $U$ ($6 \lesssim U/t \lesssim 11$) and doping $n$, a spiral ferrimagnetic phase is the most stable phase in the $(n,U)$ phase diagram. Higher values of $U$ lead to a non-spiral ferrimagnetic phase. If phase separation is allowed and the chemical potential $\mu$ replaces the doping $n$ as the independent variable, the $(\mu,U)$ phase diagram displays, in a considerable region, a spiral (for $6 \lesssim U/t \lesssim 11$) and non-spiral (for higher values of $U$) ferrimagnetic phase with fixed particle density, $n=0.5$, reflecting the opening of an energy gap in the mean-field quasi-particle bands. Comment: 8 pages, 3 figures |
| Databáze: | arXiv |
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