LETTER TO THE EDITOR: Frequency-dependent spin susceptibility in the two-dimensional Hubbard model
Abstract
A quantum Monte Carlo calculation of the dynamical spin susceptibility in the half-filled 2D Hubbard model is presented for temperature T = 0.2t and an intermediate on-site repulsion U = 4t. Using the singular-value decomposition technique we succeed in analytically continuing the Matsubara Green's function into the real-frequency domain and in deriving the spectral representation for longitudinal and transverse spin susceptibility. The simulation results, while contradicting the random-phase approximation prediction of antiferromagnetic long-range order at this temperature, are in agreement with an extension of the self-consistent renormalization approach of Moriya. The static susceptibility calculated using this technique is qualitatively consistent with the 0953-8984/9/18/003/img1 simulation results.
- Publication:
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Journal of Physics Condensed Matter
- Pub Date:
- May 1997
- DOI:
- 10.1088/0953-8984/9/18/003
- arXiv:
- arXiv:cond-mat/9602135
- Bibcode:
- 1997JPCM....9L.267C
- Keywords:
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- Condensed Matter
- E-Print:
- 4 pages, Revtex, encoded figs.uu file with 3 figures enclosed