Conserving approximations for strongly correlated electron systems: Bethe-Salpeter equation and dynamics for the two-dimensional Hubbard model
Abstract
In this Letter we describe a new technique for investigating phase transitions and dynamics in interacting electron systems. This technique is based on the derivation and self-consistent solution of infinite-order conserving approximations. It provides a new approach to the study of two-particle correlations with strong frequency and momentum dependence. We use this technique to derive a low-temperature phase diagram and dynamic correlation functions for the two-dimensional Hubbard model.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 1989
- DOI:
- 10.1103/PhysRevLett.62.961
- Bibcode:
- 1989PhRvL..62..961B
- Keywords:
-
- Bethe-Salpeter Equation;
- Electron Scattering;
- Ground State;
- Monte Carlo Method;
- Superconductivity;
- Two Dimensional Models;
- Brillouin Zones;
- Fourier Transformation;
- Green'S Functions;
- Pade Approximation;
- Solid-State Physics;
- 71.10.+x;
- 74.20.-z;
- 74.65.+n;
- 75.10.Jm;
- Theories and models of superconducting state;
- Quantized spin models