Random phase approximation for the 1D anti-ferromagnetic Heisenberg model

Details Random phase approximation for the 1D anti-ferromagnetic Heisenberg model Random phase approximation for the 1D anti-ferromagnetic Heisenberg model

2006-01-12

arxiv.org/abs/cond-mat/0601264v4

J. Phys.: Condens. Matter 18, 10249, 2006

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 8 figures, 1 table

Scientific paper

10.1088/0953-8984/18/45/011

The Hartree-Fock-RPA approach is applied to the 1D anti-ferromagnetic Heisenberg model in the Jordan-Wigner representation. Somewhat contrary to expectation, this leads to reasonable results for spectral functions and sum rules in the symmetry unbroken phase. In a preliminary application of Self-Consistent RPA to finite size chains strongly improved results are obtained.

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