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Indications of a Metallic Antiferromagnetic Phase in the 2 Dimensional $U-t-t'$ Model | | Daniel Duffy
; Adriana Moreo
; | | Date: |
30 Apr 1996 | | Abstract: | 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 $U_{c_1}/tapprox 2.5$, 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 $4<U_{c_2}/t<6$. | | Source: | arXiv, cond-mat/9604172 | | Services: | Forum | Review | PDF | Favorites | |
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