  We study the anisotropic two-dimensional Hubbard model at and near half
filling within a functional renormalization group method, focusing on the
structure of momentum-dependent correlations which grow strongly upon
approaching a critical temperature from above. We find that a finite
nearest-neighbor interchain hopping is not sufficient to introduce a
substantial momentum dependence of single-particle properties along the Fermi
surface. However, when a sufficiently large second-nearest neighbor inter-chain
hopping is introduced, the system is frustrated and we observe the appearance
of so-called "hot spots", specific points on the Fermi surface around which
scattering becomes particularly strong. We compare our results with other
studies on quasi-one-dimensional systems.
