2026-06-27T22:58:56Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/597562024-09-03T15:30:37Zcom_20.500.14352_14col_20.500.14352_15

Creffield, Charles Kornilovitch, P. E. Klepfish, E. G. Pike, E. R. Sarkar, Sarben 2023-06-20T20:10:36Z 2023-06-20T20:10:36Z 1997-05-05 0953-8984 10.1088/0953-8984/9/18/003 https://hdl.handle.net/20.500.14352/59756 http://dx.doi.org/10.1088/0953-8984/9/18/003 http://iopscience.iop.org A Quantum Monte Carlo calculation of 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 the 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 a self-consistent renormalization approach of Moriya. The static susceptibility calculated using this technique is qualitatively consistent with the ω → 0 simulation results. eng open access Frequency-dependent spin susceptibility in the two-dimensional Hubbard model journal article