Analytic Correlation Functions of the two-dimensional Half Filled Hubbard Model at Weak Coupling

Details Analytic Correlation Functions of the two-dimensional Half Filled Hubbard Model at Weak Coupling Analytic Correlation Functions of the two-dimensional Half Filled Hubbard Model at Weak Coupling

2001-09-27

arxiv.org/abs/cond-mat/0109525v2

Journal of Physics (Condensed Matter) C 14, 2653 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 5 figures

Scientific paper

10.1088/0953-8984/14/10/316

We derive explicit spin and charge correlation functions of the $N \times N$ Hubbard model from a recently obtained weak-coupling analytic ground state $|\Q^{[0]}_{AF}\ket$. The spin correlation function shows an antiferromagnetic behaviour with different signs for the two sublattices and its Fourier tranform is peaked at ${\mathbf Q}=(\p,\p)$. The charge correlation function presents two valleys at 45 degrees from the axes. Both functions behave in a smooth way with increasing $N$; the results agree well with the available numerical data.

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