Abstract
We review two very different approaches to the problem of the breakdown of Fermi liquid theory (FLT) in 2D Fermi systems. (I) First we discuss the repulsive Hubbard model. A low density expansion is shown to yield unexpected non-perturbative bound state formation, and yet FLT is robust in this regime. We also briefly review other calculations which address similar issues. (II) Next we turn to the attractive Hubbard model above its superconducting T c . With increasing attraction the normal state is shown to deviate from a Fermi liquid with pseudo-gaps in the charge and spin excitation spectrum.KeywordsHubbard ModelFermi LiquidLuttinger LiquidFermi Liquid TheoryFermi Liquid BehaviorThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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