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- W2045540111 abstract "Abstract For the U / t >0 case we have proposed a self-energy with lifetime effects generalizing a previous calculation (Rodriguez-Nunez and de Menezes (Physica A, 257 (1998) 501). Our ansatz induces our system to be a Marginal Fermi liquid for small values of the interaction. We have evaluated the three self-energy parameters using the moment approach of Nolting (Z. Physik, 255 (1972) 25) at half-filling for different values of coupling, in the paramagnetic phase. We find: (1) the density of states shows a gap for U / W ≈1. (2) the different single-particle dynamical properties evolve with interaction from almost peak structures for weak coupling to broad structures well into the insulating phase (MMIT); and (3) for intermediate values of interaction it is still possible to define the Fermi surface. However, this becomes impossible for values of interaction close to the Mott metal–insulator transition." @default.
- W2045540111 created "2016-06-24" @default.
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- W2045540111 date "1999-01-01" @default.
- W2045540111 modified "2023-09-30" @default.
- W2045540111 title "Evolution of single-particle green functions with correlation in the hubbard model at half-filling: sum rules for the spectral density" @default.
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- W2045540111 doi "https://doi.org/10.1016/s0921-4526(98)00940-5" @default.
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