 Johnson–Wilson theory

The Johnson-Wilson theory is a theoretical framework used in solid-state physics and condensed matter physics to describe the electronic structure of materials, particularly correlated electron systems like high-temperature superconductors and heavy fermion compounds. This theory builds on concepts from quantum mechanics and many-body physics. The key aspects of Johnson-Wilson theory include: 1. **Effective Hamiltonian**: The theory often employs model Hamiltonians that capture the essential interactions and correlations between electrons in a material.