Indications of a Metallic Antiferromagnetic Phase in the 2 Dimensional $U-t-t'$ Model

Details Indications of a Metallic Antiferromagnetic Phase in the 2 Dimensional $U-t-t'$ Model Indications of a Metallic Antiferromagnetic Phase in the 2 Dimensional $U-t-t'$ Model

1996-04-29

arxiv.org/abs/cond-mat/9604172v3

Physics

Condensed Matter

4 pages, RevTex 3.0, 5 figures embedded in the text, modifications in the text, as well as added data to Fig. 3

Scientific paper

10.1103/PhysRevB.55.R676

We present mean-field and quantum Monte Carlo results that suggest the existence of an itinerant antiferromagnetic ground state in the half-filled $U-t-t'$ model in two dimensions. In particular, working at $t'/t=-0.2$ we found that antiferromagnetic long range order develops at $U_{c_1}/t\approx 2.5$, while a study of the density of states $N(\omega)$ and the response to an external magnetic field indicates that the system becomes insulating at a larger coupling $4

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