QED is a theoretical framework that describes the interactions between light and matter at a fundamental level. While it has been successful in predicting and explaining many phenomena, it is not a complete theory and therefore cannot solve all solid state problems on its own.
QED is based on the principles of quantum mechanics, which govern the behavior of particles at the atomic and subatomic level. However, it does not take into account the complex interactions between large numbers of particles in a solid state system, making it limited in its ability to solve all solid state problems.
Yes, QED can be combined with other theories such as solid state physics, quantum chemistry, and materials science to provide a more comprehensive understanding of solid state systems. This interdisciplinary approach is often used to solve complex problems in the field.
QED has been successful in explaining the properties of materials such as semiconductors, superconductors, and magnets. It has also played a crucial role in the development of technologies such as transistors, lasers, and solar cells.
Yes, there is ongoing research in the field of quantum materials, where scientists are exploring the use of QED and other quantum theories to understand and manipulate the behavior of materials at the atomic scale. This could potentially lead to new breakthroughs in solving solid state problems in the future.