We consider the half-filled Hubbard model with a cut-off forbidding momenta close to the angles of the square shaped Fermi surface. By renormalization group methods we find a convergent expansion for the Schwinger function up to exponentially small temperatures. We prove that the system is not a Fermi liquid, but on the contrary it behaves like a Marginal Fermi liquid, a behaviour observed in the normal phase of high Tc superconductors.
Mastropietro, V. (2002). Marginal fermi liquid behaviour in the d = 2 Hubbard model with cut-off. ANNALES HENRI POINCARE', 3(6), 1183-1213 [10.1007/s000230200002].
Marginal fermi liquid behaviour in the d = 2 Hubbard model with cut-off
MASTROPIETRO, VIERI
2002-01-01
Abstract
We consider the half-filled Hubbard model with a cut-off forbidding momenta close to the angles of the square shaped Fermi surface. By renormalization group methods we find a convergent expansion for the Schwinger function up to exponentially small temperatures. We prove that the system is not a Fermi liquid, but on the contrary it behaves like a Marginal Fermi liquid, a behaviour observed in the normal phase of high Tc superconductors.File in questo prodotto:
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