Abstract
We study a two-dimensional Fermi liquid with a Fermi surface containing the saddle points and . Including Cooper and Peierls channel contributions leads to a one-loop renormalization group flow to strong coupling for short range repulsive interactions. In a certain parameter range the characteristics of the fixed point, opening of a spin and charge gap, and dominant pairing correlations are similar to those of a two-leg ladder at half-filling. We argue that an increase of the electron density leads to a truncation of the Fermi surface to only four disconnected arcs.
- Received 12 June 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.3195
©1998 American Physical Society