Singularities in the Vertex Function in Two-Dimensional Tight-Binding Fermi Systems |
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| Authors: | Shi-Min CUI |
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| Affiliation: | 1. Department of Applied Physics and Institute of Condensed Matter Physics Jiao Tong University, Shanghai 200030, China;2. CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, China |
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| Abstract: | The singularities in the vertex function are studied within the ladder approximation for a non-half-filled two-dimensional tight- binding Fermi system. The location of all the possible poles of the vertex function has been clarified for both repulsive and attractive interacting cases.. The scattering phase shift is examined and found not always zero at Fermi energy. The Kohn-lut tinger-like singularity is also briefly discussed. |
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