https://doi.org/10.1007/PL00011117
Electron-doping versus hole-doping in the 2D t-t' Hubbard model
Theoretische Physik, ETH-Hönggerberg, 8093 Zürich, Switzerland
Corresponding author: a chonerka@itp.phys.ethz.ch
Received:
19
December
2000
Revised:
28
February
2001
Published online: 15 May 2001
We compare the one-loop renormalization group flow to strong coupling of the electronic
interactions in the two-dimensional t-t'-Hubbard model with 
for band fillings smaller and
larger than half-filling. Using a numerical N-patch scheme (
) we show that in the
electron-doped case with decreasing electron density there is a rapid transition
from a 
-wave superconducting
regime with small characteristic energy scale to an approximate nesting regime
with strong antiferromagnetic tendencies and higher energy scales. This
contrasts with the hole-doped side discussed recently which
exhibits a broad parameter region where the renormalization group flow suggests a truncation of
the Fermi surface at the saddle points. We compare the quasiparticle scattering rates
obtained from the renormalization group calculation which further emphasize the
differences between the two cases.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.72.Jt – Other cuprates
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
