Truncation of a two-dimensional fermi surface due to quasiparticle gap formation at the saddle points

  • Furukawa N
  • Rice T
  • Salmhofer M
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We study a two-dimensional Fermi liquid with a Fermi surface containing the saddle points (π,0) and (0,π). 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.

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  • Nobuo Furukawa

  • T. M. Rice

  • Manfred Salmhofer

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