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arXiv · 1505.00583

Spiral ferrimagnetic phases in the two-dimensional Hubbard model

J. D. Gouveia·R. G. Dias
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Abstract

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.

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J. D. Gouveia, R. G. Dias. 2015-05-04. Spiral ferrimagnetic phases in the two-dimensional Hubbard model. https://arxiv.org/abs/1505.00583

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