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From Slater to Mott-Heisenberg physics: The antiferromagnetic phase of the Hubbard model

Thomas Pruschke·Robert Zitzler
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Abstract

We study the optical conductivity of the one-band Hubbard model in the Néel state at half filling at T=0 using the dynamical mean-field theory. For small values of the Coulomb parameter clear signatures of a Slater insulator expected from a weak-coupling theory are found, while the strongly correlated system can be well described in terms of a Mott-Heisenberg picture. However, in contrast to the paramagnet, we do not find any evidence for a transition between these two limiting cases but rather a smooth crossover as a function of the Coulomb interaction.

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Thomas Pruschke, Robert Zitzler. 2003-09-08. From Slater to Mott-Heisenberg physics: The antiferromagnetic phase of the Hubbard model. https://doi.org/10.1088/0953-8984%2F15%2F46%2F006

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